diff --git a/data/sql/updates/pending_db_world/rev_1671902937557452500.sql b/data/sql/updates/pending_db_world/rev_1671902937557452500.sql
new file mode 100644
index 000000000..8f50cd5ce
--- /dev/null
+++ b/data/sql/updates/pending_db_world/rev_1671902937557452500.sql
@@ -0,0 +1,3 @@
+--
+UPDATE `creature_template` SET `ScriptName` = 'boss_swamplord_muselek', `AIName`= '' WHERE `entry` = 17826;
+DELETE FROM `smart_scripts` WHERE `entryorguid` = 17826 AND `source_type` = 0;
diff --git a/src/server/scripts/Outland/CoilfangReservoir/underbog/boss_swamplord_muselek.cpp b/src/server/scripts/Outland/CoilfangReservoir/underbog/boss_swamplord_muselek.cpp
new file mode 100644
index 000000000..0d220613b
--- /dev/null
+++ b/src/server/scripts/Outland/CoilfangReservoir/underbog/boss_swamplord_muselek.cpp
@@ -0,0 +1,178 @@
+/*
+ * This file is part of the AzerothCore Project. See AUTHORS file for Copyright information
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Affero General Public License as published by the
+ * Free Software Foundation; either version 3 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "ScriptMgr.h"
+#include "ScriptedCreature.h"
+#include "the_underbog.h"
+
+enum Spells
+{
+    SPELL_SHOOT               = 22907,
+    SPELL_KNOCKAWAY           = 18813,
+    SPELL_RAPTOR_STRIKE       = 31566,
+    SPELL_MULTISHOT           = 34974,
+    SPELL_THROW_FREEZING_TRAP = 31946,
+    SPELL_AIMED_SHOT          = 31623,
+    SPELL_HUNTERS_MARK        = 31615
+};
+
+enum Text
+{
+    SAY_AGGRO     = 1,
+    SAY_KILL      = 2,
+    SAY_JUST_DIED = 3
+};
+
+enum Misc
+{
+    RANGED_GROUP = 1,
+    RANGE_CHECK  = 2
+};
+
+struct boss_swamplord_muselek : public BossAI
+{
+    boss_swamplord_muselek(Creature* creature) : BossAI(creature, DATA_MUSELEK)
+    {
+        scheduler.SetValidator([this]
+        {
+            return !me->HasUnitState(UNIT_STATE_CASTING);
+        });
+    }
+
+    void Reset() override
+    {
+        _Reset();
+        _canChase = true;
+    }
+
+    void AttackStart(Unit* victim) override
+    {
+        if (victim && me->Attack(victim, true) && me->IsWithinMeleeRange(victim))
+        {
+            me->GetMotionMaster()->MoveChase(victim);
+        }
+        else
+        {
+            me->GetMotionMaster()->MoveIdle();
+        }
+    }
+
+    void JustDied(Unit* /*killer*/) override
+    {
+        _JustDied();
+        Talk(SAY_JUST_DIED);
+    }
+
+    void KilledUnit(Unit* /*victim*/) override
+    {
+        Talk(SAY_KILL);
+    }
+
+    bool CanShootVictim()
+    {
+        return me->GetVictim() && !me->IsWithinRange(me->GetVictim(), 10.0f) && me->IsWithinLOSInMap(me->GetVictim());
+    }
+
+    void JustEngagedWith(Unit* /*who*/) override
+    {
+        _JustEngagedWith();
+        Talk(SAY_AGGRO);
+
+        scheduler.Schedule(3s, [this](TaskContext context)
+        {
+            if (CanShootVictim())
+            {
+                me->LoadEquipment(1, true);
+                DoCastVictim(SPELL_SHOOT);
+                me->GetMotionMaster()->Clear();
+            }
+            else if (_canChase)
+            {
+                me->GetMotionMaster()->MoveChase(me->GetVictim());
+            }
+
+            context.Repeat();
+        }).Schedule(15s, 30s, [this](TaskContext context)
+        {
+            if (me->GetVictim() && me->IsWithinMeleeRange(me->GetVictim()))
+            {
+                DoCastVictim(SPELL_KNOCKAWAY);
+            }
+
+            context.Repeat();
+        }).Schedule(10s, 15s, [this](TaskContext context)
+        {
+            DoCastVictim(SPELL_MULTISHOT);
+            context.Repeat(20s, 30s);
+        }).Schedule(30s, 40s, [this](TaskContext context)
+        {
+            if (Unit* target = SelectTarget(SelectTargetMethod::Random, 0, 100.0f, false, true))
+            {
+                _markTarget = target->GetGUID();
+                _canChase = false;
+                DoCastVictim(SPELL_THROW_FREEZING_TRAP);
+
+                scheduler.Schedule(3s, [this, target](TaskContext)
+                {
+                    if (target && me->GetVictim())
+                    {
+                        if (me->IsWithinMeleeRange(me->GetVictim()))
+                        {
+                            me->GetMotionMaster()->Clear();
+                            me->GetMotionMaster()->MoveBackwards(me->GetVictim(), 10.0f);
+                        }
+
+                        me->m_Events.AddEventAtOffset([this]()
+                        {
+                            if (Unit* marktarget = ObjectAccessor::GetUnit(*me, _markTarget))
+                            {
+                                DoCast(marktarget, SPELL_HUNTERS_MARK);
+                            }
+                        }, 3s);
+                    }
+                });
+
+                scheduler.Schedule(5s, [this, target](TaskContext)
+                {
+                    if (target)
+                    {
+                        me->m_Events.AddEventAtOffset([this]()
+                        {
+                            if (Unit* marktarget = ObjectAccessor::GetUnit(*me, _markTarget))
+                            {
+                                scheduler.DelayAll(5s);
+                                DoCast(marktarget, SPELL_AIMED_SHOT);
+                                _canChase = true;
+                            }
+                        }, 3s);
+                    }
+                });
+            }
+
+            context.Repeat(12s, 16s);
+        });
+    }
+
+private:
+    ObjectGuid _markTarget;
+    bool _canChase;
+};
+
+void AddSC_boss_swamplord_muselek()
+{
+    RegisterUnderbogCreatureAI(boss_swamplord_muselek);
+}
diff --git a/src/server/scripts/Outland/outland_script_loader.cpp b/src/server/scripts/Outland/outland_script_loader.cpp
index 4600cd559..ced2b80f4 100644
--- a/src/server/scripts/Outland/outland_script_loader.cpp
+++ b/src/server/scripts/Outland/outland_script_loader.cpp
@@ -56,6 +56,7 @@ void AddSC_instance_steam_vault();
 void AddSC_underbog();                       //CR Underbog
 void AddSC_boss_hungarfen();
 void AddSC_boss_ghazan();
+void AddSC_boss_swamplord_muselek();
 void AddSC_boss_the_black_stalker();
 void AddSC_instance_the_underbog();
 void AddSC_the_slave_pens();                // The Slave Pens
@@ -159,6 +160,7 @@ void AddOutlandScripts()
     AddSC_underbog();                       //CR Underbog
     AddSC_boss_hungarfen();
     AddSC_boss_ghazan();
+    AddSC_boss_swamplord_muselek();
     AddSC_boss_the_black_stalker();
     AddSC_instance_the_underbog();
     AddSC_the_slave_pens();                 //CR The Slave Pens