Clockwork Hand
Wondrous itemuncommonrequires attunement
A beautiful work of articulate brass, this prosthetic clockwork hand (or hands) can't be worn if you have both of your hands. While wearing this hand, you gain a +2 bonus to damage with melee weapon attacks made with this hand or weapons wielded in this hand.
Source: Vault of Magic · OGL-1.0a · 5.1