Core/Spells: Screams of the Dead's (51750) duration shouldn't be affected by diminishing returns

src/server/game/Spells/SpellMgr.cpp

@@ -85,6 +85,9 @@ DiminishingGroup GetDiminishingReturnsGroupForSpell(SpellInfo const* spellproto,
             // Black Plague
             else if (spellproto->Id == 64155)
                 return DIMINISHING_NONE;
+            // Screams of the Dead (King Ymiron)
+            else if (spellproto->Id == 51750)
+                return DIMINISHING_NONE;
             break;
         }
         // Event spells