Concussive Blows

Concussive blows [Minor] by Iczer

'Hey Power haus, what's shaking...besides your face that is'

The character's fists and feet store and release concussive waves when he strikes. The character adds +1D6 to any melee strikes he makes in combat from the released energy, which also gives off loud sonic booms as he does so.
When the character scores a critical strike on an opponent, the concussive waves become more dangerous.
At first level, if a target is struck with this power with a critical hit, the target must make a saving throw (16+ PE bonuses apply) or become deafened for 1D4 rounds.
At third level, a failed saving throw results in being stunned for an equal amount of time.
At fifth level, the target is also knocked down on a failed saving throw.
At eighth level, the target is knocked unconscious instead of stunned.