Death Frenzy

Usage: Active Cost: 0 action points Expend 20 hit points to enter a death frenzy (which can stack with your basic rage and frenzy), increasing your strength by 4, your critical threat multiplier when raging by an additional 1, and adding the 'Greater Vicious' property to your melee weapons (+4d6 damage / +1d3 damage to self).

More info
Frenzied_Berserker_Enhancements