Firehawk Robes of Conflagration

2 pieces: (2) Set: You have a chance to summon a Mirror Image to assist you in battle for 15 sec when you cast Frostbolt, Fireball, Frostfire Bolt, or Arcane Blast.

4 pieces: (4) Set: Your spells have an increased chance to trigger Brain Freeze or Pyroblast!. In addition, Arcane Power decreases the cost of your damaging spells by 10% instead of increasing their cost.