Attack Damage + Life Drain + Spell Damage = Power Overwhelming
Every 10 automatic attacks your next spell will deal 20 + (Life Drain Value)% more damage.
Life Drain increases the damage.
- Actually the damage buff for spells is active as soon as the buff appears. But because it lasts until after the next spell it can only benefit passive procs or sustained spells if you choose not to cast a spell.
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