The most recent PTR build updated the frost T21 4 pc set as follows:
I suspect this will not stay at 75% for Ice lance, that seems really strong. And what is the point of having the Frostbolt at all on the set bonus? Would GS opt not to cast the free shatter IL just to make their Frostbolt stronger? Doubt it.•Item - Mage T21 Frost 4P Bonus Name changed from "Item - Mage T21 Frost 4P Bonus - Brain Freeze Buffs Frostbolt" to "Item - Mage T21 Frost 4P Bonus". When you consume Brain Freeze, the damage of your next Frostbolt is increased by 75%. or Ice Lance is increased by 75%.