Core/Spells: Don't grant runic power when death knight abilities that do it using negative power cost miss and the spell has SPELL_ATTR1_DISCOUNT_POWER_ON_MISS

(cherry picked from commit 76ab2007c0540542b892dd66e9287b394c54ee42)

1 files changed, 5 insertions, 0 deletions

diff --git a/src/server/game/Spells/Spell.cpp b/src/server/game/Spells/Spell.cpp
index b79a5ad6b13..887ae7660b4 100644
--- a/src/server/game/Spells/Spell.cpp
+++ b/src/server/game/Spells/Spell.cpp
@@ -5444,6 +5444,11 @@ void Spell::TakePower()
     {
         if (!hit)
         {
+            // skipping granting power through negative cost only when spell has SPELL_ATTR1_DISCOUNT_POWER_ON_MISS is correct behavior
+            // tested with 206931 - Blooddrinker
+            if (cost.Amount < 0)
+                continue;
+
             //lower spell cost on fail (by talent aura)
             if (Player* modOwner = unitCaster->GetSpellModOwner())
                 modOwner->ApplySpellMod(m_spellInfo, SpellModOp::PowerCostOnMiss, cost.Amount);