Can't speak for melee groups, but for casters + pally tank it's free frost emblems. Frost resistance aura. Split up casters. Kill Hailstone (his aura hurts). Consecrate to gather the small adds. Casters dps Ahune. Run random caster back in range in case a spike pushes him too far away. Profit. Even with a group containing 2 frost mages (no dual spec, so they have to cast slow ass fireballs cause of his stupid immunity) it's pretty easy.