Virulent Plague

src/server/scripts/Spells/spell_dk.cpp

@@ -115,6 +115,7 @@ enum DeathKnightSpells
     SPELL_DK_SUBDUING_GRASP_TALENT = 454822,
     SPELL_DK_UNHOLY = 137007,
     SPELL_DK_UNHOLY_VIGOR = 196263,
+    SPELL_DK_VIRULENT_PLAGUE = 191587,
     SPELL_DH_VORACIOUS_LEECH = 274009,
     SPELL_DH_VORACIOUS_TALENT = 273953,
 
@@ -2061,6 +2062,58 @@ class spell_dk_dread_plague : public AuraScript
     }
 };
 
+// 191587 - Virulent Plague
+// The plague carries the periodic damage, the caster scaling and the dummy holding the spread
+// radius, so the spreading is driven from the aura apply using the radius stored in effect 1.
+class spell_dk_virulent_plague : public AuraScript
+{
+    // Spreading applies the plague again, and that application would spread once more, so the
+    // nested applications are not allowed to spread or it never stops
+    bool _spreading = false;
+
+    bool Validate(SpellInfo const* /*spellInfo*/) override
+    {
+        return ValidateSpellInfo({ SPELL_DK_VIRULENT_PLAGUE });
+    }
+
+    void HandleSpread(AuraEffect const* /*aurEff*/, AuraEffectHandleModes /*mode*/)
+    {
+        if (_spreading)
+            return;
+
+        Unit* caster = GetCaster();
+        Unit* target = GetTarget();
+        if (!caster || !target)
+            return;
+
+        float const radius = float(GetSpellInfo()->GetEffect(EFFECT_1).CalcBaseValue(caster, target, 0, 0));
+        if (radius <= 0.0f)
+            return;
+
+        std::list<Unit*> enemyList;
+        Trinity::AnyUnfriendlyUnitInObjectRangeCheck check(target, caster, radius);
+        Trinity::UnitListSearcher<Trinity::AnyUnfriendlyUnitInObjectRangeCheck> searcher(target, enemyList, check);
+        Cell::VisitAllObjects(target, searcher, radius);
+
+        _spreading = true;
+        for (Unit* unit : enemyList)
+        {
+            if (unit == target || unit->HasAura(SPELL_DK_VIRULENT_PLAGUE, caster->GetGUID()))
+                continue;
+
+            caster->CastSpell(unit, SPELL_DK_VIRULENT_PLAGUE, CastSpellExtraArgsInit{
+                .TriggerFlags = TRIGGERED_IGNORE_CAST_IN_PROGRESS | TRIGGERED_DONT_REPORT_CAST_ERROR
+            });
+        }
+        _spreading = false;
+    }
+
+    void Register() override
+    {
+        AfterEffectApply += AuraEffectApplyFn(spell_dk_virulent_plague::HandleSpread, EFFECT_0, SPELL_AURA_PERIODIC_DAMAGE, AURA_EFFECT_HANDLE_REAL_OR_REAPPLY_MASK);
+    }
+};
+
 // 1256576 - Forbidden Sacrifice (triggered by Putrefy when 1256565 - Forbidden Knowledge is known)
 class spell_dk_forbidden_sacrifice : public AuraScript
 {
@@ -2285,6 +2338,7 @@ void AddSC_deathknight_spell_scripts()
     RegisterSpellScript(spell_dk_festering_strike);
     RegisterSpellScript(spell_dk_festering_strike_scourge_strike);
     RegisterSpellScript(spell_dk_dread_plague);
+    RegisterSpellScript(spell_dk_virulent_plague);
     RegisterSpellScript(spell_dk_forbidden_sacrifice);
     RegisterSpellScript(spell_dk_frozen_dominion);
     RegisterSpellScript(spell_dk_pillar_of_frost);