@Yukzor Frost Armor/Ice Armor procs Frostbite, Frostbite targets benefit from Shatter. The hardest part is having your characters all lined up/facing the correct way. I typically will have them follow, use the V formation once I'm ready to drop the kids off so to speak, then move all the mobs to directly in front of the group. I try to get the Frost Nova off where the mobs are out of melee of the mages and still in AoE range, then I get my warrior out of the way as well since he will be low HP by this point.

@nodoze I'm primarily shouting for aggro yeah. I could try to hold onto aggro for longer but tbh the mages just don't die that much and I'm sure I'd lose some dps from less frost bite. I usually don't lose aggro until the mobs are about 40-50%. The huge burst from CoC is high.