This includes items and quests that can no longer be obtained or are now deprecated.
Missile Barrage
Missile Barrage(5 ranks)
Arcane, Tier 9
Gives your Arcane Blast a 8/16/24/32/40% chance, and your Arcane Barrage, Fireball, Frostbolt and Frostfire Bolt spells a 4/8/12/16/20% chance to reduce the channeled duration of the next Arcane Missiles spell by 2.5 secs, reduce the mana cost by 100%, and missiles will fire every .5 secs.
Patch 4.0.1 (2010-10-12): Redesigned as a tier 3 talent with 2 ranks (was a tier 9 talent with 5 ranks) - Your Arcane Missiles spell will fire its missiles every 0.5/0.6 sec.
Old: Gives your Arcane Blast a 8/16/24/32/40% chance, and your Arcane Barrage, Fireball, Frostbolt and Frostfire Bolt spells a 4/8/12/16/20% chance to reduce the channeled duration of the next Arcane Missiles spell by 2.5 secs, reduce the mana cost by 100%, and missiles will fire every .5 secs.
Patch 3.2.2 (2009-09-22): The effect from triggering this talent now removes the mana cost of Arcane Missiles. In addition, the chance for Arcane Blast to trigger this talent is now 8/16/24/32/40%. All other listed spells continue to have a 4/8/12/16/20% chance to trigger it. This talent no longer has a chance to be triggered when spells miss.