Volcano Stage: The infused shaman at the end has a big hitbox so the ice chunk from Ice Storm are more likely to hit. With 1900 power (~2500 attack overall with the frost bow) and 20 crit damage each chunk was hitting for 1200 damage and critting for 2k damage, with an average of 7-8 hits. The chill from Frost Fan and Freezing Shot help keep the boss from moving out of the aoe and also increases the downtime between his dodge attacks.
Ascalon Searing: Ice Storm tears down siege, gates and oil making it very useful for the first part of the stage. One ice storm is enough to take down a pot of oil, so with 2 ice bows you can take out both oils. Ice storm does a substantial amount to Dulfy and the gate as well so don't toss it after killing the oil pots.
Sons of Svanir Stage: Ice Storm does a wonderful job at taking down the colossal Ice Elemental and it also gives a means for the primarily melee classes to damage it. Ice storm and freezing fan are useful for tearing down the ice walls in the boss room.
Bonus Stage: One to two ice storms is enough to tear down a regular boss tentacle while doing a decent amount to veteran tentacles. It's also quite useful for classes that have weak ranged abilities.
Asuran Lab Stage: Ice Storm and frost fan are useful for the second stage of the boss fight as the four robots are very close to one another.
Edited by Featherman, 21 November 2012 - 05:07 PM.