The impact perk that makes most enemies stubble when struck with a dual casted spell. This allows me to unload on to someone without harm as I "stumble-lock" their poor souls as long as I have magika.
This makes any one on one fight a given win, and most fights against less than 3 or 4 enemies are a zero health loss fight give a fair distance. In fact the only time I need health potions are against mages using wards.
Any one else observe this, it's the only reason I continue to use destruction instead of conjuration.
