I put 5 AA points in both trees and have it mastered with 54% potency and 72% crit chance and can't get this spell to save my life, literally. it does nothing. When I get hit by a death blow, I simply die. Unyielding Will works but has a sucky recast of 12 minutes plus you have to make sure your berserked or else it kills you again. Can't the zerkers get some love on their death saves?