diff --git a/data/sql/updates/pending_db_world/rev_1695111326975856300.sql b/data/sql/updates/pending_db_world/rev_1695111326975856300.sql
new file mode 100644
index 000000000..5f5a8ba5d
--- /dev/null
+++ b/data/sql/updates/pending_db_world/rev_1695111326975856300.sql
@@ -0,0 +1,2 @@
+--
+UPDATE `creature_template` SET `mechanic_immune_mask` = `mechanic_immune_mask`|16 WHERE `entry` = 17543;
diff --git a/src/server/scripts/EasternKingdoms/Karazhan/bosses_opera.cpp b/src/server/scripts/EasternKingdoms/Karazhan/bosses_opera.cpp
index 3753a61bc..24fb4e991 100644
--- a/src/server/scripts/EasternKingdoms/Karazhan/bosses_opera.cpp
+++ b/src/server/scripts/EasternKingdoms/Karazhan/bosses_opera.cpp
@@ -508,7 +508,7 @@ struct boss_strawman : public ScriptedAI
 
     void SpellHit(Unit* /*caster*/, SpellInfo const* Spell) override
     {
-        if ((Spell->SchoolMask == SPELL_SCHOOL_MASK_FIRE) && (!(rand() % 10)))
+        if ((Spell->SchoolMask == SPELL_SCHOOL_MASK_FIRE) && roll_chance_i(10))
         {
             /*
                 if (not direct damage(aoe, dot))