Arcane Blast

Blasts the target with energy, dealing 642 to 778 Arcane damage. Each time you cast Arcane Blast, the damage of all Arcane spells is increased by 15% and mana cost of Arcane Blast is increased by 175%. Effect stacks up to 4 times and lasts 6 sec or until any Arcane damage spell except Arcane Blast is cast.