Missile Barrage

Gives your Arcane Blast spell a [m1]% chance, and your Arcane Wrath, Fireball, Frostbolt, Frost Blast, and Frostfire Bolt spells a ${[m1]/2}% chance to reduce the channeled duration of your next Arcane Missiles spell by [s1]%, reduce the Mana cost by [s3]%, and missiles fire every ${[m2]/10}.1 sec.