Dark Simulacrum for obvious reasons:
http://media.mmo-champion.com/images...Simulacrum.jpg
Havn't done any math so far, but really, Deep Freeze, it must be the highest possible hiting spell, in pve ofc.
In pvp, I've no idea^^ Spellreflect? Can it increase the dmg of the spell which is returned if the warrior's buffed?