diff --git a/src/server/game/AI/CoreAI/GameObjectAI.h b/src/server/game/AI/CoreAI/GameObjectAI.h
index b366d3c2b..80e034cf4 100644
--- a/src/server/game/AI/CoreAI/GameObjectAI.h
+++ b/src/server/game/AI/CoreAI/GameObjectAI.h
@@ -46,7 +46,7 @@ public:
 
     // Pass parameters between AI
     virtual void DoAction(int32 /*param = 0 */) {}
-    virtual void SetGUID(ObjectGuid /*guid*/, int32 /*id = 0 */) {}
+    virtual void SetGUID(ObjectGuid const& /*guid*/, int32 /*id = 0 */) {}
     virtual ObjectGuid GetGUID(int32 /*id = 0 */) const { return ObjectGuid::Empty; }
 
     static int32 Permissible(GameObject const* go);
diff --git a/src/server/game/AI/CoreAI/UnitAI.h b/src/server/game/AI/CoreAI/UnitAI.h
index 17533d4e4..71cfe8d5b 100644
--- a/src/server/game/AI/CoreAI/UnitAI.h
+++ b/src/server/game/AI/CoreAI/UnitAI.h
@@ -217,7 +217,7 @@ public:
     virtual void DoAction(int32 /*param*/) {}
     virtual uint32 GetData(uint32 /*id = 0*/) const { return 0; }
     virtual void SetData(uint32 /*id*/, uint32 /*value*/) {}
-    virtual void SetGUID(ObjectGuid /*guid*/, int32 /*id*/ = 0) {}
+    virtual void SetGUID(ObjectGuid const& /*guid*/, int32 /*id*/ = 0) {}
     virtual ObjectGuid GetGUID(int32 /*id*/ = 0) const { return ObjectGuid::Empty; }
 
     // Select the best target (in <targetType> order) from the threat list that fulfill the following:
diff --git a/src/server/game/AI/ScriptedAI/ScriptedGossip.cpp b/src/server/game/AI/ScriptedAI/ScriptedGossip.cpp
index 120a75582..12d5a6368 100644
--- a/src/server/game/AI/ScriptedAI/ScriptedGossip.cpp
+++ b/src/server/game/AI/ScriptedAI/ScriptedGossip.cpp
@@ -42,7 +42,7 @@ void AddGossipItemFor(Player* player, uint32 gossipMenuID, uint32 gossipMenuItem
     player->PlayerTalkClass->GetGossipMenu().AddMenuItem(gossipMenuID, gossipMenuItemID, sender, action, boxMoney);
 }
 
-void SendGossipMenuFor(Player* player, uint32 npcTextID, ObjectGuid const guid)
+void SendGossipMenuFor(Player* player, uint32 npcTextID, ObjectGuid const& guid)
 {
     player->PlayerTalkClass->SendGossipMenu(npcTextID, guid);
 }
diff --git a/src/server/game/AI/ScriptedAI/ScriptedGossip.h b/src/server/game/AI/ScriptedAI/ScriptedGossip.h
index eee841148..b88aea5c4 100644
--- a/src/server/game/AI/ScriptedAI/ScriptedGossip.h
+++ b/src/server/game/AI/ScriptedAI/ScriptedGossip.h
@@ -94,7 +94,7 @@ void AddGossipItemFor(Player* player, uint32 icon, std::string const& text, uint
 void AddGossipItemFor(Player* player, uint32 gossipMenuID, uint32 gossipMenuItemID, uint32 sender, uint32 action, uint32 boxMoney = 0);
 
 // Send menu text
-void SendGossipMenuFor(Player* player, uint32 npcTextID, ObjectGuid const guid);
+void SendGossipMenuFor(Player* player, uint32 npcTextID, ObjectGuid const& guid);
 void SendGossipMenuFor(Player* player, uint32 npcTextID, Creature const* creature);
 
 // Close menu
diff --git a/src/server/game/AI/SmartScripts/SmartAI.cpp b/src/server/game/AI/SmartScripts/SmartAI.cpp
index cb4067e0c..c1dead666 100644
--- a/src/server/game/AI/SmartScripts/SmartAI.cpp
+++ b/src/server/game/AI/SmartScripts/SmartAI.cpp
@@ -993,7 +993,7 @@ void SmartAI::SetData(uint32 id, uint32 value, WorldObject* invoker)
     GetScript()->ProcessEventsFor(SMART_EVENT_DATA_SET, unit, id, value, false, nullptr, gob);
 }
 
-void SmartAI::SetGUID(ObjectGuid /*guid*/, int32 /*id*/)
+void SmartAI::SetGUID(ObjectGuid const& /*guid*/, int32 /*id*/)
 {
 }
 
diff --git a/src/server/game/AI/SmartScripts/SmartAI.h b/src/server/game/AI/SmartScripts/SmartAI.h
index 5bd9fcd8b..48d0eda37 100644
--- a/src/server/game/AI/SmartScripts/SmartAI.h
+++ b/src/server/game/AI/SmartScripts/SmartAI.h
@@ -164,7 +164,7 @@ public:
     void SetData(uint32 id, uint32 value, WorldObject* invoker);
 
     // Used in scripts to share variables
-    void SetGUID(ObjectGuid guid, int32 id = 0) override;
+    void SetGUID(ObjectGuid const& guid, int32 id = 0) override;
 
     // Used in scripts to share variables
     ObjectGuid GetGUID(int32 id = 0) const override;
diff --git a/src/server/game/Battlefield/Battlefield.cpp b/src/server/game/Battlefield/Battlefield.cpp
index f74aebff2..2adb61047 100644
--- a/src/server/game/Battlefield/Battlefield.cpp
+++ b/src/server/game/Battlefield/Battlefield.cpp
@@ -855,7 +855,7 @@ GameObject* Battlefield::SpawnGameObject(uint32 entry, float x, float y, float z
     return go;
 }
 
-Creature* Battlefield::GetCreature(ObjectGuid const guid)
+Creature* Battlefield::GetCreature(ObjectGuid const& guid)
 {
     if (!m_Map)
         return nullptr;
@@ -863,7 +863,7 @@ Creature* Battlefield::GetCreature(ObjectGuid const guid)
     return m_Map->GetCreature(guid);
 }
 
-GameObject* Battlefield::GetGameObject(ObjectGuid const guid)
+GameObject* Battlefield::GetGameObject(ObjectGuid const& guid)
 {
     if (!m_Map)
         return nullptr;
diff --git a/src/server/game/Battlefield/Battlefield.h b/src/server/game/Battlefield/Battlefield.h
index 6b2abdfc5..c4f94f071 100644
--- a/src/server/game/Battlefield/Battlefield.h
+++ b/src/server/game/Battlefield/Battlefield.h
@@ -303,8 +303,8 @@ public:
     Creature* SpawnCreature(uint32 entry, Position pos, TeamId teamId);
     GameObject* SpawnGameObject(uint32 entry, float x, float y, float z, float o);
 
-    Creature* GetCreature(ObjectGuid const guid);
-    GameObject* GetGameObject(ObjectGuid const guid);
+    Creature* GetCreature(ObjectGuid const& guid);
+    GameObject* GetGameObject(ObjectGuid const& guid);
 
     // Script-methods
 
diff --git a/src/server/game/Entities/Corpse/Corpse.cpp b/src/server/game/Entities/Corpse/Corpse.cpp
index 249ac7adb..1971a3dc7 100644
--- a/src/server/game/Entities/Corpse/Corpse.cpp
+++ b/src/server/game/Entities/Corpse/Corpse.cpp
@@ -121,7 +121,7 @@ void Corpse::DeleteFromDB(CharacterDatabaseTransaction trans)
     DeleteFromDB(GetOwnerGUID(), trans);
 }
 
-void Corpse::DeleteFromDB(ObjectGuid const ownerGuid, CharacterDatabaseTransaction trans)
+void Corpse::DeleteFromDB(ObjectGuid const& ownerGuid, CharacterDatabaseTransaction trans)
 {
     CharacterDatabasePreparedStatement* stmt = CharacterDatabase.GetPreparedStatement(CHAR_DEL_CORPSE);
     stmt->SetData(0, ownerGuid.GetCounter());
diff --git a/src/server/game/Entities/Corpse/Corpse.h b/src/server/game/Entities/Corpse/Corpse.h
index e74f2c943..9027a608a 100644
--- a/src/server/game/Entities/Corpse/Corpse.h
+++ b/src/server/game/Entities/Corpse/Corpse.h
@@ -63,7 +63,7 @@ public:
     bool LoadCorpseFromDB(ObjectGuid::LowType guid, Field* fields);
 
     void DeleteFromDB(CharacterDatabaseTransaction trans);
-    static void DeleteFromDB(ObjectGuid const ownerGuid, CharacterDatabaseTransaction trans);
+    static void DeleteFromDB(ObjectGuid const& ownerGuid, CharacterDatabaseTransaction trans);
 
     [[nodiscard]] ObjectGuid GetOwnerGUID() const { return GetGuidValue(CORPSE_FIELD_OWNER); }
 
diff --git a/src/server/game/Entities/GameObject/GameObject.cpp b/src/server/game/Entities/GameObject/GameObject.cpp
index d8897ab12..4bad8703e 100644
--- a/src/server/game/Entities/GameObject/GameObject.cpp
+++ b/src/server/game/Entities/GameObject/GameObject.cpp
@@ -3051,13 +3051,13 @@ SpellInfo const* GameObject::GetSpellForLock(Player const* player) const
     return nullptr;
 }
 
-void GameObject::AddToSkillupList(ObjectGuid playerGuid)
+void GameObject::AddToSkillupList(ObjectGuid const& playerGuid)
 {
     int32 timer = GetMap()->IsDungeon() ? -1 : 10 * MINUTE * IN_MILLISECONDS;
     m_SkillupList[playerGuid] = timer;
 }
 
-bool GameObject::IsInSkillupList(ObjectGuid playerGuid) const
+bool GameObject::IsInSkillupList(ObjectGuid const& playerGuid) const
 {
     for (auto const& itr : m_SkillupList)
     {
diff --git a/src/server/game/Entities/GameObject/GameObject.h b/src/server/game/Entities/GameObject/GameObject.h
index 1b8ccd047..5ca9ad61e 100644
--- a/src/server/game/Entities/GameObject/GameObject.h
+++ b/src/server/game/Entities/GameObject/GameObject.h
@@ -231,8 +231,8 @@ public:
     void RemoveLootMode(uint16 lootMode) { m_LootMode &= ~lootMode; }
     void ResetLootMode() { m_LootMode = LOOT_MODE_DEFAULT; }
 
-    void AddToSkillupList(ObjectGuid playerGuid);
-    [[nodiscard]] bool IsInSkillupList(ObjectGuid playerGuid) const;
+    void AddToSkillupList(ObjectGuid const& playerGuid);
+    [[nodiscard]] bool IsInSkillupList(ObjectGuid const& playerGuid) const;
 
     void AddUniqueUse(Player* player);
     void AddUse() { ++m_usetimes; }
diff --git a/src/server/game/Entities/Object/ObjectGuid.h b/src/server/game/Entities/Object/ObjectGuid.h
index a8d99fe80..5a3deff9e 100644
--- a/src/server/game/Entities/Object/ObjectGuid.h
+++ b/src/server/game/Entities/Object/ObjectGuid.h
@@ -269,7 +269,7 @@ class PackedGuid
         explicit PackedGuid(ObjectGuid guid) : _packedGuid(PACKED_GUID_MIN_BUFFER_SIZE) { _packedGuid.appendPackGUID(guid.GetRawValue()); }
 
         void Set(uint64 guid) { _packedGuid.wpos(0); _packedGuid.appendPackGUID(guid); }
-        void Set(ObjectGuid guid) { _packedGuid.wpos(0); _packedGuid.appendPackGUID(guid.GetRawValue()); }
+        void Set(ObjectGuid const& guid) { _packedGuid.wpos(0); _packedGuid.appendPackGUID(guid.GetRawValue()); }
 
         [[nodiscard]] std::size_t size() const { return _packedGuid.size(); }
 
diff --git a/src/server/game/Entities/Player/Player.cpp b/src/server/game/Entities/Player/Player.cpp
index a82d55eb8..a8cb733de 100644
--- a/src/server/game/Entities/Player/Player.cpp
+++ b/src/server/game/Entities/Player/Player.cpp
@@ -2088,7 +2088,7 @@ bool Player::CanInteractWithQuestGiver(Object* questGiver)
     return false;
 }
 
-Creature* Player::GetNPCIfCanInteractWith(ObjectGuid guid, uint32 npcflagmask)
+Creature* Player::GetNPCIfCanInteractWith(ObjectGuid const& guid, uint32 npcflagmask)
 {
     // unit checks
     if (!guid)
@@ -2145,7 +2145,7 @@ Creature* Player::GetNPCIfCanInteractWith(ObjectGuid guid, uint32 npcflagmask)
     return creature;
 }
 
-GameObject* Player::GetGameObjectIfCanInteractWith(ObjectGuid guid, GameobjectTypes type) const
+GameObject* Player::GetGameObjectIfCanInteractWith(ObjectGuid const& guid, GameobjectTypes type) const
 {
     if (GameObject* go = GetMap()->GetGameObject(guid))
     {
@@ -4616,7 +4616,7 @@ void Player::KillPlayer()
     //UpdateObjectVisibility(); // pussywizard: not needed
 }
 
-void Player::OfflineResurrect(ObjectGuid const guid, CharacterDatabaseTransaction trans)
+void Player::OfflineResurrect(ObjectGuid const& guid, CharacterDatabaseTransaction trans)
 {
     Corpse::DeleteFromDB(guid, trans);
     CharacterDatabasePreparedStatement* stmt = CharacterDatabase.GetPreparedStatement(CHAR_UPD_ADD_AT_LOGIN_FLAG);
diff --git a/src/server/game/Entities/Player/Player.h b/src/server/game/Entities/Player/Player.h
index ea2cd277a..1e57a5649 100644
--- a/src/server/game/Entities/Player/Player.h
+++ b/src/server/game/Entities/Player/Player.h
@@ -1128,8 +1128,8 @@ public:
     void SendInstanceResetWarning(uint32 mapid, Difficulty difficulty, uint32 time, bool onEnterMap);
 
     bool CanInteractWithQuestGiver(Object* questGiver);
-    Creature* GetNPCIfCanInteractWith(ObjectGuid guid, uint32 npcflagmask);
-    [[nodiscard]] GameObject* GetGameObjectIfCanInteractWith(ObjectGuid guid, GameobjectTypes type) const;
+    Creature* GetNPCIfCanInteractWith(ObjectGuid const& guid, uint32 npcflagmask);
+    [[nodiscard]] GameObject* GetGameObjectIfCanInteractWith(ObjectGuid const& guid, GameobjectTypes type) const;
 
     void ToggleAFK();
     void ToggleDND();
@@ -2033,7 +2033,7 @@ public:
     Corpse* CreateCorpse();
     void RemoveCorpse();
     void KillPlayer();
-    static void OfflineResurrect(ObjectGuid const guid, CharacterDatabaseTransaction trans);
+    static void OfflineResurrect(ObjectGuid const& guid, CharacterDatabaseTransaction trans);
     [[nodiscard]] bool HasCorpse() const { return _corpseLocation.GetMapId() != MAPID_INVALID; }
     [[nodiscard]] WorldLocation GetCorpseLocation() const { return _corpseLocation; }
     uint32 GetResurrectionSpellId();
diff --git a/src/server/game/Entities/Player/SocialMgr.cpp b/src/server/game/Entities/Player/SocialMgr.cpp
index d5b5fdf59..8ace05873 100644
--- a/src/server/game/Entities/Player/SocialMgr.cpp
+++ b/src/server/game/Entities/Player/SocialMgr.cpp
@@ -37,7 +37,7 @@ uint32 PlayerSocial::GetNumberOfSocialsWithFlag(SocialFlag flag) const
     return counter;
 }
 
-bool PlayerSocial::AddToSocialList(ObjectGuid friendGuid, SocialFlag flag)
+bool PlayerSocial::AddToSocialList(ObjectGuid const& friendGuid, SocialFlag flag)
 {
     // check client limits
     if (GetNumberOfSocialsWithFlag(flag) >= (((flag & SOCIAL_FLAG_FRIEND) != 0) ? SOCIALMGR_FRIEND_LIMIT : SOCIALMGR_IGNORE_LIMIT))
@@ -71,7 +71,7 @@ bool PlayerSocial::AddToSocialList(ObjectGuid friendGuid, SocialFlag flag)
     return true;
 }
 
-void PlayerSocial::RemoveFromSocialList(ObjectGuid friendGuid, SocialFlag flag)
+void PlayerSocial::RemoveFromSocialList(ObjectGuid const& friendGuid, SocialFlag flag)
 {
     auto itr = m_playerSocialMap.find(friendGuid);
     if (itr == m_playerSocialMap.end())                     // not exist
@@ -102,7 +102,7 @@ void PlayerSocial::RemoveFromSocialList(ObjectGuid friendGuid, SocialFlag flag)
     }
 }
 
-void PlayerSocial::SetFriendNote(ObjectGuid friendGuid, std::string note)
+void PlayerSocial::SetFriendNote(ObjectGuid const& friendGuid, std::string note)
 {
     auto itr = m_playerSocialMap.find(friendGuid);
     if (itr == m_playerSocialMap.end())                     // not exist
@@ -176,7 +176,7 @@ void PlayerSocial::SendSocialList(Player* player, uint32 flags)
     LOG_DEBUG("network", "WORLD: Sent SMSG_CONTACT_LIST");
 }
 
-bool PlayerSocial::_checkContact(ObjectGuid guid, SocialFlag flags) const
+bool PlayerSocial::_checkContact(ObjectGuid const& guid, SocialFlag flags) const
 {
     auto const& itr = m_playerSocialMap.find(guid);
     if (itr != m_playerSocialMap.end())
@@ -185,12 +185,12 @@ bool PlayerSocial::_checkContact(ObjectGuid guid, SocialFlag flags) const
     return false;
 }
 
-bool PlayerSocial::HasFriend(ObjectGuid friend_guid) const
+bool PlayerSocial::HasFriend(ObjectGuid const& friend_guid) const
 {
     return _checkContact(friend_guid, SOCIAL_FLAG_FRIEND);
 }
 
-bool PlayerSocial::HasIgnore(ObjectGuid ignore_guid) const
+bool PlayerSocial::HasIgnore(ObjectGuid const& ignore_guid) const
 {
     return _checkContact(ignore_guid, SOCIAL_FLAG_IGNORED);
 }
@@ -209,7 +209,7 @@ SocialMgr* SocialMgr::instance()
     return &instance;
 }
 
-void SocialMgr::GetFriendInfo(Player* player, ObjectGuid friendGUID, FriendInfo& friendInfo)
+void SocialMgr::GetFriendInfo(Player* player, ObjectGuid const& friendGUID, FriendInfo& friendInfo)
 {
     if (!player)
         return;
@@ -247,14 +247,14 @@ void SocialMgr::GetFriendInfo(Player* player, ObjectGuid friendGUID, FriendInfo&
     }
 }
 
-void SocialMgr::MakeFriendStatusPacket(FriendsResult result, ObjectGuid guid, WorldPacket* data)
+void SocialMgr::MakeFriendStatusPacket(FriendsResult result, ObjectGuid const& guid, WorldPacket* data)
 {
     data->Initialize(SMSG_FRIEND_STATUS, 9);
     *data << uint8(result);
     *data << guid;
 }
 
-void SocialMgr::SendFriendStatus(Player* player, FriendsResult result, ObjectGuid friendGuid, bool broadcast)
+void SocialMgr::SendFriendStatus(Player* player, FriendsResult result, ObjectGuid const& friendGuid, bool broadcast)
 {
     FriendInfo fi;
     GetFriendInfo(player, friendGuid, fi);
@@ -316,7 +316,7 @@ void SocialMgr::BroadcastToFriendListers(Player* player, WorldPacket* packet)
     }
 }
 
-PlayerSocial* SocialMgr::LoadFromDB(PreparedQueryResult result, ObjectGuid guid)
+PlayerSocial* SocialMgr::LoadFromDB(PreparedQueryResult result, ObjectGuid const& guid)
 {
     PlayerSocial* social = &m_socialMap[guid];
     social->SetPlayerGUID(guid);
diff --git a/src/server/game/Entities/Player/SocialMgr.h b/src/server/game/Entities/Player/SocialMgr.h
index a35187b6f..5995f05e9 100644
--- a/src/server/game/Entities/Player/SocialMgr.h
+++ b/src/server/game/Entities/Player/SocialMgr.h
@@ -104,19 +104,19 @@ class PlayerSocial
     public:
         PlayerSocial();
         // adding/removing
-        bool AddToSocialList(ObjectGuid friend_guid, SocialFlag flag);
-        void RemoveFromSocialList(ObjectGuid friend_guid, SocialFlag flag);
-        void SetFriendNote(ObjectGuid friendGuid, std::string note);
+        bool AddToSocialList(ObjectGuid const& friend_guid, SocialFlag flag);
+        void RemoveFromSocialList(ObjectGuid const& friend_guid, SocialFlag flag);
+        void SetFriendNote(ObjectGuid const& friendGuid, std::string note);
         // Packet send's
         void SendSocialList(Player* player, uint32 flags);
         // Misc
-        bool HasFriend(ObjectGuid friend_guid) const;
-        bool HasIgnore(ObjectGuid ignore_guid) const;
-        ObjectGuid GetPlayerGUID() const { return m_playerGUID; }
-        void SetPlayerGUID(ObjectGuid guid) { m_playerGUID = guid; }
+        bool HasFriend(ObjectGuid const& friend_guid) const;
+        bool HasIgnore(ObjectGuid const& ignore_guid) const;
+        ObjectGuid const& GetPlayerGUID() const { return m_playerGUID; }
+        void SetPlayerGUID(ObjectGuid const& guid) { m_playerGUID = guid; }
         uint32 GetNumberOfSocialsWithFlag(SocialFlag flag) const;
     private:
-        bool _checkContact(ObjectGuid guid, SocialFlag flags) const;
+        bool _checkContact(ObjectGuid const& guid, SocialFlag flags) const;
         typedef std::map<ObjectGuid, FriendInfo> PlayerSocialMap;
         PlayerSocialMap m_playerSocialMap;
         ObjectGuid m_playerGUID;
@@ -131,14 +131,14 @@ class SocialMgr
     public:
         static SocialMgr* instance();
         // Misc
-        void RemovePlayerSocial(ObjectGuid guid) { m_socialMap.erase(guid); }
-        static void GetFriendInfo(Player* player, ObjectGuid friendGUID, FriendInfo& friendInfo);
+        void RemovePlayerSocial(ObjectGuid const& guid) { m_socialMap.erase(guid); }
+        static void GetFriendInfo(Player* player, ObjectGuid const& friendGUID, FriendInfo& friendInfo);
         // Packet management
-        void MakeFriendStatusPacket(FriendsResult result, ObjectGuid friend_guid, WorldPacket* data);
-        void SendFriendStatus(Player* player, FriendsResult result, ObjectGuid friend_guid, bool broadcast);
+        void MakeFriendStatusPacket(FriendsResult result, ObjectGuid const& friend_guid, WorldPacket* data);
+        void SendFriendStatus(Player* player, FriendsResult result, ObjectGuid const& friend_guid, bool broadcast);
         void BroadcastToFriendListers(Player* player, WorldPacket* packet);
         // Loading
-        PlayerSocial* LoadFromDB(PreparedQueryResult result, ObjectGuid guid);
+        PlayerSocial* LoadFromDB(PreparedQueryResult result, ObjectGuid const& guid);
     private:
         typedef std::map<ObjectGuid, PlayerSocial> SocialMap;
         SocialMap m_socialMap;
diff --git a/src/server/game/Globals/ObjectAccessor.cpp b/src/server/game/Globals/ObjectAccessor.cpp
index f9a4cb01e..22a9d39b1 100644
--- a/src/server/game/Globals/ObjectAccessor.cpp
+++ b/src/server/game/Globals/ObjectAccessor.cpp
@@ -112,7 +112,7 @@ namespace PlayerNameMapHolder
 
 } // namespace PlayerNameMapHolder
 
-WorldObject* ObjectAccessor::GetWorldObject(WorldObject const& p, ObjectGuid const guid)
+WorldObject* ObjectAccessor::GetWorldObject(WorldObject const& p, ObjectGuid const& guid)
 {
     switch (guid.GetHigh())
     {
@@ -138,7 +138,7 @@ WorldObject* ObjectAccessor::GetWorldObject(WorldObject const& p, ObjectGuid con
     return nullptr;
 }
 
-Object* ObjectAccessor::GetObjectByTypeMask(WorldObject const& p, ObjectGuid const guid, uint32 typemask)
+Object* ObjectAccessor::GetObjectByTypeMask(WorldObject const& p, ObjectGuid const& guid, uint32 typemask)
 {
     switch (guid.GetHigh())
     {
@@ -176,27 +176,27 @@ Object* ObjectAccessor::GetObjectByTypeMask(WorldObject const& p, ObjectGuid con
     return nullptr;
 }
 
-Corpse* ObjectAccessor::GetCorpse(WorldObject const& u, ObjectGuid const guid)
+Corpse* ObjectAccessor::GetCorpse(WorldObject const& u, ObjectGuid const& guid)
 {
     return u.GetMap()->GetCorpse(guid);
 }
 
-GameObject* ObjectAccessor::GetGameObject(WorldObject const& u, ObjectGuid const guid)
+GameObject* ObjectAccessor::GetGameObject(WorldObject const& u, ObjectGuid const& guid)
 {
     return u.GetMap()->GetGameObject(guid);
 }
 
-Transport* ObjectAccessor::GetTransport(WorldObject const& u, ObjectGuid const guid)
+Transport* ObjectAccessor::GetTransport(WorldObject const& u, ObjectGuid const& guid)
 {
     return u.GetMap()->GetTransport(guid);
 }
 
-DynamicObject* ObjectAccessor::GetDynamicObject(WorldObject const& u, ObjectGuid const guid)
+DynamicObject* ObjectAccessor::GetDynamicObject(WorldObject const& u, ObjectGuid const& guid)
 {
     return u.GetMap()->GetDynamicObject(guid);
 }
 
-Unit* ObjectAccessor::GetUnit(WorldObject const& u, ObjectGuid const guid)
+Unit* ObjectAccessor::GetUnit(WorldObject const& u, ObjectGuid const& guid)
 {
     if (guid.IsPlayer())
         return GetPlayer(u, guid);
@@ -207,17 +207,17 @@ Unit* ObjectAccessor::GetUnit(WorldObject const& u, ObjectGuid const guid)
     return GetCreature(u, guid);
 }
 
-Creature* ObjectAccessor::GetCreature(WorldObject const& u, ObjectGuid const guid)
+Creature* ObjectAccessor::GetCreature(WorldObject const& u, ObjectGuid const& guid)
 {
     return u.GetMap()->GetCreature(guid);
 }
 
-Pet* ObjectAccessor::GetPet(WorldObject const& u, ObjectGuid const guid)
+Pet* ObjectAccessor::GetPet(WorldObject const& u, ObjectGuid const& guid)
 {
     return u.GetMap()->GetPet(guid);
 }
 
-Player* ObjectAccessor::GetPlayer(Map const* m, ObjectGuid const guid)
+Player* ObjectAccessor::GetPlayer(Map const* m, ObjectGuid const& guid)
 {
     if (Player * player = HashMapHolder<Player>::Find(guid))
         if (player->IsInWorld() && player->GetMap() == m)
@@ -226,12 +226,12 @@ Player* ObjectAccessor::GetPlayer(Map const* m, ObjectGuid const guid)
     return nullptr;
 }
 
-Player* ObjectAccessor::GetPlayer(WorldObject const& u, ObjectGuid const guid)
+Player* ObjectAccessor::GetPlayer(WorldObject const& u, ObjectGuid const& guid)
 {
     return GetPlayer(u.GetMap(), guid);
 }
 
-Creature* ObjectAccessor::GetCreatureOrPetOrVehicle(WorldObject const& u, ObjectGuid const guid)
+Creature* ObjectAccessor::GetCreatureOrPetOrVehicle(WorldObject const& u, ObjectGuid const& guid)
 {
     if (guid.IsPet())
         return GetPet(u, guid);
diff --git a/src/server/game/Globals/ObjectAccessor.h b/src/server/game/Globals/ObjectAccessor.h
index 2fbe70bf5..2a78eee0d 100644
--- a/src/server/game/Globals/ObjectAccessor.h
+++ b/src/server/game/Globals/ObjectAccessor.h
@@ -60,18 +60,18 @@ public:
 namespace ObjectAccessor
 {
     // these functions return objects only if in map of specified object
-    WorldObject* GetWorldObject(WorldObject const&, ObjectGuid const guid);
-    Object* GetObjectByTypeMask(WorldObject const&, ObjectGuid const guid, uint32 typemask);
-    Corpse* GetCorpse(WorldObject const& u, ObjectGuid const guid);
-    GameObject* GetGameObject(WorldObject const& u, ObjectGuid const guid);
-    Transport* GetTransport(WorldObject const& u, ObjectGuid const guid);
-    DynamicObject* GetDynamicObject(WorldObject const& u, ObjectGuid const guid);
-    Unit* GetUnit(WorldObject const&, ObjectGuid const guid);
-    Creature* GetCreature(WorldObject const& u, ObjectGuid const guid);
-    Pet* GetPet(WorldObject const&, ObjectGuid const guid);
-    Player* GetPlayer(Map const*, ObjectGuid const guid);
-    Player* GetPlayer(WorldObject const&, ObjectGuid const guid);
-    Creature* GetCreatureOrPetOrVehicle(WorldObject const&, ObjectGuid const);
+    WorldObject* GetWorldObject(WorldObject const&, ObjectGuid const& guid);
+    Object* GetObjectByTypeMask(WorldObject const&, ObjectGuid const& guid, uint32 typemask);
+    Corpse* GetCorpse(WorldObject const& u, ObjectGuid const& guid);
+    GameObject* GetGameObject(WorldObject const& u, ObjectGuid const& guid);
+    Transport* GetTransport(WorldObject const& u, ObjectGuid const& guid);
+    DynamicObject* GetDynamicObject(WorldObject const& u, ObjectGuid const& guid);
+    Unit* GetUnit(WorldObject const&, ObjectGuid const& guid);
+    Creature* GetCreature(WorldObject const& u, ObjectGuid const& guid);
+    Pet* GetPet(WorldObject const&, ObjectGuid const& guid);
+    Player* GetPlayer(Map const*, ObjectGuid const& guid);
+    Player* GetPlayer(WorldObject const&, ObjectGuid const& guid);
+    Creature* GetCreatureOrPetOrVehicle(WorldObject const&, ObjectGuid const&);
 
     // these functions return objects if found in whole world
     // ACCESS LIKE THAT IS NOT THREAD SAFE
diff --git a/src/server/game/Maps/Map.cpp b/src/server/game/Maps/Map.cpp
index de0e4a9bd..85f8275e8 100644
--- a/src/server/game/Maps/Map.cpp
+++ b/src/server/game/Maps/Map.cpp
@@ -2358,27 +2358,27 @@ void BattlegroundMap::RemoveAllPlayers()
                     player->TeleportTo(player->GetEntryPoint());
 }
 
-Corpse* Map::GetCorpse(ObjectGuid const guid)
+Corpse* Map::GetCorpse(ObjectGuid const& guid)
 {
     return _objectsStore.Find<Corpse>(guid);
 }
 
-Creature* Map::GetCreature(ObjectGuid const guid)
+Creature* Map::GetCreature(ObjectGuid const& guid)
 {
     return _objectsStore.Find<Creature>(guid);
 }
 
-GameObject* Map::GetGameObject(ObjectGuid const guid)
+GameObject* Map::GetGameObject(ObjectGuid const& guid)
 {
     return _objectsStore.Find<GameObject>(guid);
 }
 
-Pet* Map::GetPet(ObjectGuid const guid)
+Pet* Map::GetPet(ObjectGuid const& guid)
 {
     return dynamic_cast<Pet*>(_objectsStore.Find<Creature>(guid));
 }
 
-Transport* Map::GetTransport(ObjectGuid guid)
+Transport* Map::GetTransport(ObjectGuid const& guid)
 {
     if (guid.GetHigh() != HighGuid::Mo_Transport && guid.GetHigh() != HighGuid::Transport)
         return nullptr;
@@ -2387,7 +2387,7 @@ Transport* Map::GetTransport(ObjectGuid guid)
     return go ? go->ToTransport() : nullptr;
 }
 
-DynamicObject* Map::GetDynamicObject(ObjectGuid guid)
+DynamicObject* Map::GetDynamicObject(ObjectGuid const& guid)
 {
     return _objectsStore.Find<DynamicObject>(guid);
 }
@@ -2679,7 +2679,7 @@ void Map::RemoveCorpse(Corpse* corpse)
         _corpseBones.erase(corpse);
 }
 
-Corpse* Map::ConvertCorpseToBones(ObjectGuid const ownerGuid, bool insignia /*= false*/)
+Corpse* Map::ConvertCorpseToBones(ObjectGuid const& ownerGuid, bool insignia /*= false*/)
 {
     Corpse* corpse = GetCorpseByPlayer(ownerGuid);
     if (!corpse)
diff --git a/src/server/game/Maps/Map.h b/src/server/game/Maps/Map.h
index 20551da8a..06451fb1d 100644
--- a/src/server/game/Maps/Map.h
+++ b/src/server/game/Maps/Map.h
@@ -338,12 +338,12 @@ public:
     GameObject* SummonGameObject(uint32 entry, Position const& pos, float rotation0 = 0.0f, float rotation1 = 0.0f, float rotation2 = 0.0f, float rotation3 = 0.0f, uint32 respawnTime = 100, bool checkTransport = true);
     void SummonCreatureGroup(uint8 group, std::list<TempSummon*>* list = nullptr);
 
-    Corpse* GetCorpse(ObjectGuid const guid);
-    Creature* GetCreature(ObjectGuid const guid);
-    GameObject* GetGameObject(ObjectGuid const guid);
-    Transport* GetTransport(ObjectGuid const guid);
-    DynamicObject* GetDynamicObject(ObjectGuid const guid);
-    Pet* GetPet(ObjectGuid const guid);
+    Corpse* GetCorpse(ObjectGuid const& guid);
+    Creature* GetCreature(ObjectGuid const& guid);
+    GameObject* GetGameObject(ObjectGuid const& guid);
+    Transport* GetTransport(ObjectGuid const& guid);
+    DynamicObject* GetDynamicObject(ObjectGuid const& guid);
+    Pet* GetPet(ObjectGuid const& guid);
 
     MapStoredObjectTypesContainer& GetObjectsStore() { return _objectsStore; }
 
@@ -438,7 +438,7 @@ public:
     void DeleteCorpseData();
     void AddCorpse(Corpse* corpse);
     void RemoveCorpse(Corpse* corpse);
-    Corpse* ConvertCorpseToBones(ObjectGuid const ownerGuid, bool insignia = false);
+    Corpse* ConvertCorpseToBones(ObjectGuid const& ownerGuid, bool insignia = false);
     void RemoveOldCorpses();
 
     static void DeleteRespawnTimesInDB(uint16 mapId, uint32 instanceId);
diff --git a/src/server/game/World/WorldState.cpp b/src/server/game/World/WorldState.cpp
index ebb11b8bf..b22c0de6a 100644
--- a/src/server/game/World/WorldState.cpp
+++ b/src/server/game/World/WorldState.cpp
@@ -852,7 +852,7 @@ void WorldState::HandleSunsReachSubPhaseTransition(int32 subPhaseMask, bool init
         if (!initial)
         {
             std::lock_guard<std::mutex> guard(m_sunsReachData.m_sunsReachReclamationMutex);
-            for (ObjectGuid& guid : m_sunsReachData.m_sunsReachReclamationPlayers)
+            for (ObjectGuid const& guid : m_sunsReachData.m_sunsReachReclamationPlayers)
                 if (Player* player = ObjectAccessor::FindPlayer(guid))
                 {
                     if (start)
diff --git a/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/boss_chromaggus.cpp b/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/boss_chromaggus.cpp
index cf39b53a1..873cfdc74 100644
--- a/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/boss_chromaggus.cpp
+++ b/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/boss_chromaggus.cpp
@@ -118,7 +118,7 @@ public:
             return !victim->HasAura(SPELL_TIMELAPSE);
         }
 
-        void SetGUID(ObjectGuid guid, int32 id) override
+        void SetGUID(ObjectGuid const& guid, int32 id) override
         {
             if (id == GUID_LEVER_USER)
             {
diff --git a/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/boss_razorgore.cpp b/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/boss_razorgore.cpp
index 4b82654fb..de984f635 100644
--- a/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/boss_razorgore.cpp
+++ b/src/server/scripts/EasternKingdoms/BlackrockMountain/BlackwingLair/boss_razorgore.cpp
@@ -152,7 +152,7 @@ public:
             }
         }
 
-        void SetGUID(ObjectGuid const guid, int32 /*id*/) override
+        void SetGUID(ObjectGuid const& guid, int32 /*id*/) override
         {
             _charmerGUID = guid;
         }
diff --git a/src/server/scripts/EasternKingdoms/BlackrockMountain/MoltenCore/boss_ragnaros.cpp b/src/server/scripts/EasternKingdoms/BlackrockMountain/MoltenCore/boss_ragnaros.cpp
index 1280914f4..6cde45bdd 100644
--- a/src/server/scripts/EasternKingdoms/BlackrockMountain/MoltenCore/boss_ragnaros.cpp
+++ b/src/server/scripts/EasternKingdoms/BlackrockMountain/MoltenCore/boss_ragnaros.cpp
@@ -183,7 +183,7 @@ public:
             }
         }
 
-        void SetGUID(ObjectGuid guid, int32 index) override
+        void SetGUID(ObjectGuid const& guid, int32 index) override
         {
             if (index == GO_LAVA_BURST)
             {
diff --git a/src/server/scripts/EasternKingdoms/Gnomeregan/instance_gnomeregan.cpp b/src/server/scripts/EasternKingdoms/Gnomeregan/instance_gnomeregan.cpp
index e4125d70d..b1afd209a 100644
--- a/src/server/scripts/EasternKingdoms/Gnomeregan/instance_gnomeregan.cpp
+++ b/src/server/scripts/EasternKingdoms/Gnomeregan/instance_gnomeregan.cpp
@@ -131,7 +131,7 @@ public:
         uint32 checkTimer;
         ObjectGuid playerGUID;
 
-        void SetGUID(ObjectGuid guid, int32) override
+        void SetGUID(ObjectGuid const& guid, int32) override
         {
             playerGUID = guid;
         }
diff --git a/src/server/scripts/EasternKingdoms/Karazhan/boss_shade_of_aran.cpp b/src/server/scripts/EasternKingdoms/Karazhan/boss_shade_of_aran.cpp
index f804a2878..15e175dde 100644
--- a/src/server/scripts/EasternKingdoms/Karazhan/boss_shade_of_aran.cpp
+++ b/src/server/scripts/EasternKingdoms/Karazhan/boss_shade_of_aran.cpp
@@ -151,7 +151,7 @@ struct boss_shade_of_aran : public BossAI
         return me->GetDistance2d(roomCenter.GetPositionX(), roomCenter.GetPositionY()) < 45.0f;
     }
 
-    void SetGUID(ObjectGuid guid, int32 id) override
+    void SetGUID(ObjectGuid const& guid, int32 id) override
     {
         if (id == ACTION_ATIESH_REACT && !_atieshReaction)
         {
diff --git a/src/server/scripts/EasternKingdoms/ScarletEnclave/chapter1.cpp b/src/server/scripts/EasternKingdoms/ScarletEnclave/chapter1.cpp
index b70c90063..c8244d493 100644
--- a/src/server/scripts/EasternKingdoms/ScarletEnclave/chapter1.cpp
+++ b/src/server/scripts/EasternKingdoms/ScarletEnclave/chapter1.cpp
@@ -396,7 +396,7 @@ public:
                 AttackStart(attacker);
         }
 
-        void SetGUID(ObjectGuid guid, int32) override
+        void SetGUID(ObjectGuid const& guid, int32) override
         {
             gothikGUID = guid;
             events.ScheduleEvent(EVENT_GHOUL_MOVE_TO_PIT, 3s);
@@ -806,7 +806,7 @@ public:
 
         ObjectGuid prisonerGUID;
 
-        void SetGUID(ObjectGuid guid, int32 /*id*/) override
+        void SetGUID(ObjectGuid const& guid, int32 /*id*/) override
         {
             if (!prisonerGUID)
                 prisonerGUID = guid;
@@ -866,7 +866,7 @@ public:
 
         ObjectGuid minerGUID;
 
-        void SetGUID(ObjectGuid guid, int32 /*id*/) override
+        void SetGUID(ObjectGuid const& guid, int32 /*id*/) override
         {
             minerGUID = guid;
         }
diff --git a/src/server/scripts/EasternKingdoms/ZulGurub/boss_mandokir.cpp b/src/server/scripts/EasternKingdoms/ZulGurub/boss_mandokir.cpp
index b455b71e8..ad623291f 100644
--- a/src/server/scripts/EasternKingdoms/ZulGurub/boss_mandokir.cpp
+++ b/src/server/scripts/EasternKingdoms/ZulGurub/boss_mandokir.cpp
@@ -250,7 +250,7 @@ public:
             }
         }
 
-        void SetGUID(ObjectGuid const guid, int32 type) override
+        void SetGUID(ObjectGuid const& guid, int32 type) override
         {
             if (type == ACTION_CHARGE)
             {
@@ -564,7 +564,7 @@ public:
             RevivePlayer(victim, reviveGUID);
         }
 
-        void SetGUID(ObjectGuid const guid, int32 /*type = 0 */) override
+        void SetGUID(ObjectGuid const& guid, int32 /*type = 0 */) override
         {
             reviveGUID = guid;
         }
@@ -612,7 +612,7 @@ public:
         revivePlayerGUID.Clear();
     }
 
-    void SetGUID(ObjectGuid const guid, int32 /*id*/) override
+    void SetGUID(ObjectGuid const& guid, int32 /*id*/) override
     {
         revivePlayerGUID = guid;
     }
diff --git a/src/server/scripts/EasternKingdoms/zone_eastern_plaguelands.cpp b/src/server/scripts/EasternKingdoms/zone_eastern_plaguelands.cpp
index 6b5ff5937..6f9246e3f 100644
--- a/src/server/scripts/EasternKingdoms/zone_eastern_plaguelands.cpp
+++ b/src/server/scripts/EasternKingdoms/zone_eastern_plaguelands.cpp
@@ -93,7 +93,7 @@ public:
             _faction = faction;
         }
 
-        void SetGUID(ObjectGuid guid, int32) override
+        void SetGUID(ObjectGuid const& guid, int32) override
         {
             _playerGUID = guid;
             me->ReplaceAllNpcFlags(UNIT_NPC_FLAG_NONE);
diff --git a/src/server/scripts/EasternKingdoms/zone_undercity.cpp b/src/server/scripts/EasternKingdoms/zone_undercity.cpp
index dcfd61342..efd608da0 100644
--- a/src/server/scripts/EasternKingdoms/zone_undercity.cpp
+++ b/src/server/scripts/EasternKingdoms/zone_undercity.cpp
@@ -118,7 +118,7 @@ public:
             _events.ScheduleEvent(EVENT_MULTI_SHOT, 10s);
         }
 
-        void SetGUID(ObjectGuid guid, int32 type) override
+        void SetGUID(ObjectGuid const& guid, int32 type) override
         {
             if (type == GUID_EVENT_INVOKER)
             {
diff --git a/src/server/scripts/Events/brewfest.cpp b/src/server/scripts/Events/brewfest.cpp
index 31d72e61a..84138e5d3 100644
--- a/src/server/scripts/Events/brewfest.cpp
+++ b/src/server/scripts/Events/brewfest.cpp
@@ -1743,7 +1743,7 @@ struct npc_coren_direbrew_sisters : public ScriptedAI
 {
     npc_coren_direbrew_sisters(Creature* creature) : ScriptedAI(creature) { }
 
-    void SetGUID(ObjectGuid guid, int32 id) override
+    void SetGUID(ObjectGuid const& guid, int32 id) override
     {
         if (id == DATA_TARGET_GUID)
         {
diff --git a/src/server/scripts/Kalimdor/CavernsOfTime/BattleForMountHyjal/boss_archimonde.cpp b/src/server/scripts/Kalimdor/CavernsOfTime/BattleForMountHyjal/boss_archimonde.cpp
index 6caa1ff95..7b1ccf257 100644
--- a/src/server/scripts/Kalimdor/CavernsOfTime/BattleForMountHyjal/boss_archimonde.cpp
+++ b/src/server/scripts/Kalimdor/CavernsOfTime/BattleForMountHyjal/boss_archimonde.cpp
@@ -335,7 +335,7 @@ struct boss_archimonde : public BossAI
         Talk(SAY_SLAY);
     }
 
-    void SetGUID(ObjectGuid guid, int32 type) override
+    void SetGUID(ObjectGuid const& guid, int32 type) override
     {
         if (type == GUID_GAIN_SOUL_CHARGE_PLAYER)
         {
diff --git a/src/server/scripts/Kalimdor/RuinsOfAhnQiraj/boss_ossirian.cpp b/src/server/scripts/Kalimdor/RuinsOfAhnQiraj/boss_ossirian.cpp
index 7b56c464d..10141d57c 100644
--- a/src/server/scripts/Kalimdor/RuinsOfAhnQiraj/boss_ossirian.cpp
+++ b/src/server/scripts/Kalimdor/RuinsOfAhnQiraj/boss_ossirian.cpp
@@ -154,7 +154,7 @@ struct boss_ossirian : public BossAI
         }
     }
 
-    void SetGUID(ObjectGuid guid, int32 action) override
+    void SetGUID(ObjectGuid const& guid, int32 action) override
     {
         if (action == ACTION_TRIGGER_WEAKNESS && guid != _firstCrystalGUID)
         {
@@ -317,7 +317,7 @@ public:
     {
         go_ossirian_crystalAI(GameObject* go) : GameObjectAI(go), _instance(go->GetInstanceScript()) { }
 
-        void SetGUID(ObjectGuid guid, int32 type) override
+        void SetGUID(ObjectGuid const& guid, int32 type) override
         {
             if (type == GUID_TRIGGER_PAIR)
             {
diff --git a/src/server/scripts/Kalimdor/zone_darkshore.cpp b/src/server/scripts/Kalimdor/zone_darkshore.cpp
index c3a76fc63..0efe73836 100644
--- a/src/server/scripts/Kalimdor/zone_darkshore.cpp
+++ b/src/server/scripts/Kalimdor/zone_darkshore.cpp
@@ -552,7 +552,7 @@ public:
             }
         }
 
-        void SetGUID(ObjectGuid /*guid*/, int32 type) override
+        void SetGUID(ObjectGuid const& /*guid*/, int32 type) override
         {
             if (type == GUID_SCRIPT_INVOKER && _scriptRunning == false)
             {
diff --git a/src/server/scripts/Kalimdor/zone_desolace.cpp b/src/server/scripts/Kalimdor/zone_desolace.cpp
index 276c37bd8..94fb1505f 100644
--- a/src/server/scripts/Kalimdor/zone_desolace.cpp
+++ b/src/server/scripts/Kalimdor/zone_desolace.cpp
@@ -129,7 +129,7 @@ public:
             ImmuneFlagSet(false, _faction);
         }
 
-        void SetGUID(ObjectGuid playerGUID, int32 faction) override
+        void SetGUID(ObjectGuid const& playerGUID, int32 faction) override
         {
             _playerGUID = playerGUID;
             _faction = faction;
diff --git a/src/server/scripts/Northrend/IcecrownCitadel/boss_blood_prince_council.cpp b/src/server/scripts/Northrend/IcecrownCitadel/boss_blood_prince_council.cpp
index 7f18b8474..afc11c5cc 100644
--- a/src/server/scripts/Northrend/IcecrownCitadel/boss_blood_prince_council.cpp
+++ b/src/server/scripts/Northrend/IcecrownCitadel/boss_blood_prince_council.cpp
@@ -1293,7 +1293,7 @@ public:
             }
         }
 
-        void SetGUID(ObjectGuid guid, int32 /*type*/) override
+        void SetGUID(ObjectGuid const& guid, int32 /*type*/) override
         {
             _chaseGUID = guid;
         }
diff --git a/src/server/scripts/Northrend/IcecrownCitadel/boss_blood_queen_lana_thel.cpp b/src/server/scripts/Northrend/IcecrownCitadel/boss_blood_queen_lana_thel.cpp
index 5deccbc0b..599477698 100644
--- a/src/server/scripts/Northrend/IcecrownCitadel/boss_blood_queen_lana_thel.cpp
+++ b/src/server/scripts/Northrend/IcecrownCitadel/boss_blood_queen_lana_thel.cpp
@@ -533,7 +533,7 @@ public:
             return _bloodboltedPlayers.count(guid) != 0;
         }
 
-        void SetGUID(ObjectGuid guid, int32 type = 0) override
+        void SetGUID(ObjectGuid const& guid, int32 type = 0) override
         {
             switch (type)
             {
diff --git a/src/server/scripts/Northrend/IcecrownCitadel/boss_icecrown_gunship_battle.cpp b/src/server/scripts/Northrend/IcecrownCitadel/boss_icecrown_gunship_battle.cpp
index f4bd5ff7b..c9cfe56d4 100644
--- a/src/server/scripts/Northrend/IcecrownCitadel/boss_icecrown_gunship_battle.cpp
+++ b/src/server/scripts/Northrend/IcecrownCitadel/boss_icecrown_gunship_battle.cpp
@@ -703,7 +703,7 @@ public:
             }
         }
 
-        void SetGUID(ObjectGuid guid, int32 id/* = 0*/) override
+        void SetGUID(ObjectGuid const& guid, int32 id/* = 0*/) override
         {
             if (id != ACTION_SHIP_VISITS_ENEMY && id != ACTION_SHIP_VISITS_SELF)
                 return;
diff --git a/src/server/scripts/Northrend/IcecrownCitadel/boss_professor_putricide.cpp b/src/server/scripts/Northrend/IcecrownCitadel/boss_professor_putricide.cpp
index 165e8e77e..a7f0794fa 100644
--- a/src/server/scripts/Northrend/IcecrownCitadel/boss_professor_putricide.cpp
+++ b/src/server/scripts/Northrend/IcecrownCitadel/boss_professor_putricide.cpp
@@ -745,7 +745,7 @@ public:
 
     ObjectGuid targetGUID;
 
-    void SetGUID(ObjectGuid guid, int32 type) override
+    void SetGUID(ObjectGuid const& guid, int32 type) override
     {
         if (type == -1)
             targetGUID = guid;
diff --git a/src/server/scripts/Northrend/IcecrownCitadel/boss_sindragosa.cpp b/src/server/scripts/Northrend/IcecrownCitadel/boss_sindragosa.cpp
index f64788381..2dc55ae95 100644
--- a/src/server/scripts/Northrend/IcecrownCitadel/boss_sindragosa.cpp
+++ b/src/server/scripts/Northrend/IcecrownCitadel/boss_sindragosa.cpp
@@ -698,7 +698,7 @@ public:
         uint32 _existenceCheckTimer;
         uint16 _asphyxiationTimer;
 
-        void SetGUID(ObjectGuid guid, int32 type) override
+        void SetGUID(ObjectGuid const& guid, int32 type) override
         {
             if (type == DATA_TRAPPED_PLAYER)
                 _trappedPlayerGUID = guid;
diff --git a/src/server/scripts/Northrend/IcecrownCitadel/boss_the_lich_king.cpp b/src/server/scripts/Northrend/IcecrownCitadel/boss_the_lich_king.cpp
index ecaf28219..b33567ca0 100644
--- a/src/server/scripts/Northrend/IcecrownCitadel/boss_the_lich_king.cpp
+++ b/src/server/scripts/Northrend/IcecrownCitadel/boss_the_lich_king.cpp
@@ -2536,7 +2536,7 @@ public:
             }
         }
 
-        void SetGUID(ObjectGuid guid, int32 /* = 0*/) override
+        void SetGUID(ObjectGuid const& guid, int32 /* = 0*/) override
         {
             _grabbedPlayer = guid;
         }
diff --git a/src/server/scripts/Northrend/IcecrownCitadel/icecrown_citadel.cpp b/src/server/scripts/Northrend/IcecrownCitadel/icecrown_citadel.cpp
index 64d616b5d..74221610a 100644
--- a/src/server/scripts/Northrend/IcecrownCitadel/icecrown_citadel.cpp
+++ b/src/server/scripts/Northrend/IcecrownCitadel/icecrown_citadel.cpp
@@ -772,7 +772,7 @@ public:
             }
         }
 
-        void SetGUID(ObjectGuid guid, int32 type/* = 0*/) override
+        void SetGUID(ObjectGuid const& guid, int32 type/* = 0*/) override
         {
             if (type == ACTION_VRYKUL_DEATH)
             {
diff --git a/src/server/scripts/Northrend/zone_borean_tundra.cpp b/src/server/scripts/Northrend/zone_borean_tundra.cpp
index 03d0df839..2ff4dc6d2 100644
--- a/src/server/scripts/Northrend/zone_borean_tundra.cpp
+++ b/src/server/scripts/Northrend/zone_borean_tundra.cpp
@@ -1421,7 +1421,7 @@ public:
             _playerGUID.Clear();
         }
 
-        void SetGUID(ObjectGuid guid, int32 /*action*/) override
+        void SetGUID(ObjectGuid const& guid, int32 /*action*/) override
         {
             if (_playerGUID)
                 return;
diff --git a/src/server/scripts/Northrend/zone_dragonblight.cpp b/src/server/scripts/Northrend/zone_dragonblight.cpp
index a7eab2215..b8e657602 100644
--- a/src/server/scripts/Northrend/zone_dragonblight.cpp
+++ b/src/server/scripts/Northrend/zone_dragonblight.cpp
@@ -1093,7 +1093,7 @@ public:
             me->GetMotionMaster()->Clear();
         }
 
-        void SetGUID(ObjectGuid guid, int32  /*id*/) override
+        void SetGUID(ObjectGuid const& guid, int32  /*id*/) override
         {
             if (playerGUID || events.HasTimeUntilEvent(998) || events.HasTimeUntilEvent(2))
                 return;
diff --git a/src/server/scripts/Outland/Auchindoun/AuchenaiCrypts/boss_exarch_maladaar.cpp b/src/server/scripts/Outland/Auchindoun/AuchenaiCrypts/boss_exarch_maladaar.cpp
index 3b7a60e26..df5dd8c7d 100644
--- a/src/server/scripts/Outland/Auchindoun/AuchenaiCrypts/boss_exarch_maladaar.cpp
+++ b/src/server/scripts/Outland/Auchindoun/AuchenaiCrypts/boss_exarch_maladaar.cpp
@@ -241,7 +241,7 @@ struct npc_stolen_soul : public ScriptedAI
         });
     }
 
-    void SetGUID(ObjectGuid guid, int32 /*id*/) override
+    void SetGUID(ObjectGuid const& guid, int32 /*id*/) override
     {
         _targetGuid = guid;
     }
diff --git a/src/server/scripts/Outland/Auchindoun/ShadowLabyrinth/boss_murmur.cpp b/src/server/scripts/Outland/Auchindoun/ShadowLabyrinth/boss_murmur.cpp
index fcf8f38c5..a4c40812f 100644
--- a/src/server/scripts/Outland/Auchindoun/ShadowLabyrinth/boss_murmur.cpp
+++ b/src/server/scripts/Outland/Auchindoun/ShadowLabyrinth/boss_murmur.cpp
@@ -114,7 +114,7 @@ struct boss_murmur : public BossAI
         return true;
     }
 
-    void SetGUID(ObjectGuid guid, int32 index) override
+    void SetGUID(ObjectGuid const& guid, int32 index) override
     {
         if (index == GUID_MURMUR_NPCS)
         {
diff --git a/src/server/scripts/Outland/zone_blades_edge_mountains.cpp b/src/server/scripts/Outland/zone_blades_edge_mountains.cpp
index e024541c8..81e4b4b5a 100644
--- a/src/server/scripts/Outland/zone_blades_edge_mountains.cpp
+++ b/src/server/scripts/Outland/zone_blades_edge_mountains.cpp
@@ -670,7 +670,7 @@ public:
         }
 
         // Used for getting involved player guid. Parameter id is used for defining if is a large(Monument) or small(Relic) node
-        void SetGUID(ObjectGuid guid, int32 id) override
+        void SetGUID(ObjectGuid const& guid, int32 id) override
         {
             me->SetCanFly(true);
 
diff --git a/src/server/scripts/Outland/zone_nagrand.cpp b/src/server/scripts/Outland/zone_nagrand.cpp
index d0c6df380..7f462f79e 100644
--- a/src/server/scripts/Outland/zone_nagrand.cpp
+++ b/src/server/scripts/Outland/zone_nagrand.cpp
@@ -303,7 +303,7 @@ public:
         uint32 HealTimer;
         uint32 FrostShockTimer;
 
-        void SetGUID(ObjectGuid guid, int32  /*questId*/) override
+        void SetGUID(ObjectGuid const& guid, int32  /*questId*/) override
         {
             me->SetStandState(UNIT_STAND_STATE_STAND);
             Start(true, false, guid);
diff --git a/src/server/scripts/Outland/zone_netherstorm.cpp b/src/server/scripts/Outland/zone_netherstorm.cpp
index c014ab876..71cb5064b 100644
--- a/src/server/scripts/Outland/zone_netherstorm.cpp
+++ b/src/server/scripts/Outland/zone_netherstorm.cpp
@@ -99,7 +99,7 @@ public:
             npc_escortAI::MoveInLineOfSight(who);
         }
 
-        void SetGUID(ObjectGuid playerGUID, int32 type) override
+        void SetGUID(ObjectGuid const& playerGUID, int32 type) override
         {
             if (type == DATA_START_ENCOUNTER)
             {
diff --git a/src/server/scripts/World/boss_emerald_dragons.cpp b/src/server/scripts/World/boss_emerald_dragons.cpp
index 2bd68ffcd..458984900 100644
--- a/src/server/scripts/World/boss_emerald_dragons.cpp
+++ b/src/server/scripts/World/boss_emerald_dragons.cpp
@@ -219,7 +219,7 @@ public:
             });
         }
 
-        void SetGUID(ObjectGuid guid, int32 type) override
+        void SetGUID(ObjectGuid const& guid, int32 type) override
         {
             if (type == GUID_DRAGON)
             {