Zeitgeist - Deus Ex Machina
+2 Razorburst Rapier
This sword looks like a rapier, but has a tiny mechanical device attached to the guard. The blade's edge consists of a thin, sharpened wire that works like a razor chainsaw when the sword's mechanism is activated.
Razorburst Weapon (weapon property)
Price +1 enhancement bonus.
Aura faint transmutation; CL 8th; Weight –
When the wielder of a razorburst weapon damages an enemy that has fewer hit points than double the weapon’s enhancement modifier (the GM should inform the player when this is the case), the weapon shrieks as its bladed teeth saw back and forth as a mechanism near the hilt unspools. The target must make a Fortitude save (DC = damage dealt by the attack). On a success, the target loses an extremity of its choice—hand, foot, arm, or leg. On a failure, the attacker chooses which extremity the target loses. Creatures without extremities are unaffected.
A severed arm or hand prevents use of anything that they were holding or carrying. A severed foot slows the target. A severed leg renders the target prone.