You work yourself into a frenzy against an opponent who fails to fall before you.
Prerequisites
Strength 13.
Benefit
Each time you successfully strike an opponent with a melee weapon, you gain a +1 bonus on future melee damage rolls against them. This bonus stacks with each successful attack against that target to a maximum equal to your base attack bonus.
If you do not make any attacks against an opponent for one round, the damage bonus against that opponent is lost.