Core/Scripts: apply resilience on Vampiric Touch and Unstable Affliction dispel effect

- Spell with SPELL_ATTR4_FIXED_DAMAGE won't do it by itself to avoid applying resilience twice, but because those are triggered from a periodic aura, those apply resilience on tick, not saved to amount.
- This is one of the cases where you have to call Unit::SpellDamageBonusTaken directly

Closes #21393

(cherry picked from commit 3753ec56476d597b180968eb673cb20776785f31)

2 files changed, 14 insertions, 3 deletions

diff --git a/src/server/scripts/Spells/spell_priest.cpp b/src/server/scripts/Spells/spell_priest.cpp
index f7bf7a68672..9efb49d5935 100644
--- a/src/server/scripts/Spells/spell_priest.cpp
+++ b/src/server/scripts/Spells/spell_priest.cpp
@@ -1209,8 +1209,12 @@ class spell_pri_vampiric_touch : public SpellScriptLoader
                         if (AuraEffect const* aurEff = GetEffect(EFFECT_1))
                         {
                             // backfire damage
+                            int32 bp = aurEff->GetAmount();
+                            bp = target->SpellDamageBonusTaken(caster, aurEff->GetSpellInfo(), bp, DOT);
+                            bp *= 8;
+
                             CastSpellExtraArgs args(aurEff);
-                            args.AddSpellBP0(aurEff->GetAmount() * 8);
+                            args.AddSpellBP0(bp);
                             caster->CastSpell(target, SPELL_PRIEST_VAMPIRIC_TOUCH_DISPEL, args);
                         }
                     }
diff --git a/src/server/scripts/Spells/spell_warlock.cpp b/src/server/scripts/Spells/spell_warlock.cpp
index f4fcb96ace5..f11802d79a5 100644
--- a/src/server/scripts/Spells/spell_warlock.cpp
+++ b/src/server/scripts/Spells/spell_warlock.cpp
@@ -904,13 +904,20 @@ class spell_warl_unstable_affliction : public SpellScriptLoader
             void HandleDispel(DispelInfo* dispelInfo)
             {
                 if (Unit* caster = GetCaster())
+                {
                     if (AuraEffect const* aurEff = GetEffect(EFFECT_1))
                     {
+                        Unit* target = dispelInfo->GetDispeller();
+                        int32 bp = aurEff->GetAmount();
+                        bp = target->SpellDamageBonusTaken(caster, aurEff->GetSpellInfo(), bp, DOT);
+                        bp *= 9;
+
                         // backfire damage and silence
                         CastSpellExtraArgs args(aurEff);
-                        args.AddSpellBP0(aurEff->GetAmount() * 9);
-                        caster->CastSpell(dispelInfo->GetDispeller(), SPELL_WARLOCK_UNSTABLE_AFFLICTION_DISPEL, args);
+                        args.AddSpellBP0(bp);
+                        caster->CastSpell(target, SPELL_WARLOCK_UNSTABLE_AFFLICTION_DISPEL, args);
                     }
+                }
             }
 
             void Register() override