I think it would be interesting to give warriors a new skill based on Berserk, we'll call it: Limit Break
Skill Name: Limit Break
Level: 45
Cost: 10 Rage
Cooldown: 4 minutes
Requires: Berserk buff to cast
Limit Break increases physical attack and physical damage by [ 1 - Current Health/Max Health ]% for 3 seconds + 0.1 second per level. ( 3 second @ lvl 0, 12.8 seconds @ 98 ).
Basically the less health you have after going Berserk, the more damage you do. As you heal up, you actually lose damage potential. This is what I've always thought Berserk should have been like, but here's a companion skill so RW won't have to mess up the current Berserk.