Power Attack

Gives your next melee attack more damage, but at the cost of accuracy. On a critical hit, the target must make a fortitude save (DC = Level + 2x Str mod) or be knocked back 5 feet (immune to knockback if larger than you).
Damage goes up as it is improved. Attack Penalty will always be -3 to hit.

Level 1: Damage Bonus = +3

Level 6: Damage Bonus = +7

Level 8: Damage Bonus = +12