Scripts/Spells: Implement priest talent Expiation (#31448)

2 files changed, 65 insertions, 0 deletions

diff --git a/sql/updates/world/master/2025_12_21_01_world.sql b/sql/updates/world/master/2025_12_21_01_world.sql
new file mode 100644
index 00000000000..820158770a0
--- /dev/null
+++ b/sql/updates/world/master/2025_12_21_01_world.sql
@@ -0,0 +1,4 @@
+DELETE FROM `spell_script_names` WHERE `ScriptName` IN ('spell_pri_expiation');
+INSERT INTO `spell_script_names` (`spell_id`, `ScriptName`) VALUES
+(8092, 'spell_pri_expiation'),
+(32379, 'spell_pri_expiation');
diff --git a/src/server/scripts/Spells/spell_priest.cpp b/src/server/scripts/Spells/spell_priest.cpp
index 5e42eec1432..aae97c70501 100644
--- a/src/server/scripts/Spells/spell_priest.cpp
+++ b/src/server/scripts/Spells/spell_priest.cpp
@@ -94,6 +94,8 @@ enum PriestSpells
     SPELL_PRIEST_ESSENCE_DEVOURER                   = 415479,
     SPELL_PRIEST_ESSENCE_DEVOURER_SHADOWFIEND_HEAL  = 415673,
     SPELL_PRIEST_ESSENCE_DEVOURER_MINDBENDER_HEAL   = 415676,
+    SPELL_PRIEST_EXPIATION                          = 390832,
+    SPELL_PRIEST_EXPIATION_DAMAGE                   = 390844,
     SPELL_PRIEST_FLASH_HEAL                         = 2061,
     SPELL_PRIEST_FROM_DARKNESS_COMES_LIGHT_AURA     = 390617,
     SPELL_PRIEST_GREATER_HEAL                       = 289666,
@@ -1338,6 +1340,64 @@ class spell_pri_evangelism : public SpellScript
     }
 };
 
+// 390832 - Expiation
+// Triggered by 8092 - Mind Blast and 32379 - Shadow Word: Death
+class spell_pri_expiation : public SpellScript
+{
+    bool Validate(SpellInfo const* /*spellInfo*/) override
+    {
+        return ValidateSpellInfo({ SPELL_PRIEST_EXPIATION_DAMAGE })
+            && ValidateSpellEffect({ { SPELL_PRIEST_EXPIATION, EFFECT_1 }, { SPELL_PRIEST_SHADOW_WORD_PAIN, EFFECT_1 } });
+    }
+
+    bool Load() override
+    {
+        return GetCaster()->HasAura(SPELL_PRIEST_EXPIATION);
+    }
+
+    void HandleHitTarget(SpellEffIndex /*effIndex*/) const
+    {
+        Unit* caster = GetCaster();
+        Unit* target = GetHitUnit();
+
+        Aura const* expiation = caster->GetAura(SPELL_PRIEST_EXPIATION);
+        if (!expiation)
+            return;
+
+        AuraEffect const* expiationConsume = expiation->GetEffect(EFFECT_0);
+        AuraEffect const* expiationDmgMul = expiation->GetEffect(EFFECT_1);
+        if (!expiationConsume || !expiationDmgMul)
+            return;
+
+        AuraEffect const* swPainAuraEffect = target->GetAuraEffect(SPELL_PRIEST_SHADOW_WORD_PAIN, EFFECT_1, caster->GetGUID());
+        if (!swPainAuraEffect)
+            return;
+
+        Aura* swPainAura = swPainAuraEffect->GetBase();
+        int32 debuffDuration = swPainAura->GetDuration();
+        int32 consumeDuration = std::min(debuffDuration, expiationConsume->GetAmount() * IN_MILLISECONDS);
+        if (consumeDuration == 0)
+            return;
+
+        float ticksConsumed = static_cast<float>(consumeDuration) / swPainAuraEffect->GetPeriod();
+        float damagePerTick = swPainAuraEffect->CalculateEstimatedAmount(caster, swPainAuraEffect->GetAmount()).value_or(swPainAuraEffect->GetAmount());
+        int32 totalDamage = static_cast<int32>(damagePerTick * ticksConsumed);
+
+        swPainAura->SetDuration(debuffDuration - consumeDuration);
+
+        caster->CastSpell(target, SPELL_PRIEST_EXPIATION_DAMAGE, CastSpellExtraArgsInit
+        {
+            .TriggerFlags = TRIGGERED_IGNORE_CAST_IN_PROGRESS | TRIGGERED_DONT_REPORT_CAST_ERROR,
+            .SpellValueOverrides = { { SPELLVALUE_BASE_POINT0, CalculatePct(totalDamage, expiationDmgMul->GetAmount()) } }
+        });
+    }
+
+    void Register() override
+    {
+        OnEffectHitTarget += SpellEffectFn(spell_pri_expiation::HandleHitTarget, EFFECT_0, SPELL_EFFECT_SCHOOL_DAMAGE);
+    }
+};
+
 // 33110 - Prayer of Mending (Heal)
 class spell_pri_focused_mending : public SpellScript
 {
@@ -3929,6 +3989,7 @@ void AddSC_priest_spell_scripts()
     RegisterSpellScript(spell_pri_epiphany);
     RegisterSpellScript(spell_pri_essence_devourer_heal);
     RegisterSpellScript(spell_pri_evangelism);
+    RegisterSpellScript(spell_pri_expiation);
     RegisterSpellScript(spell_pri_focused_mending);
     RegisterSpellScript(spell_pri_from_darkness_comes_light);
     RegisterSpellScript(spell_pri_guardian_spirit);