Deformity (Clawed Hands)( Book of Vile Darkness, p. 48)
Because of intentional self-mutilation, the character has deformed arms and hands ending in sharp claws.
Willing Deformity (BV) ,
The character has the ability to deal 1d6 points of damage as an unarmed claw attack. The character is considered armed even when unarmed.
The character does not draw attacks of opportunity when attacking unarmed, and he threatens areas even when unarmed.