Whenever you would normally be able to draw a weapon, you can collapse your mechanical hand into your forearm with a flick of the wrist, extending a wide blade in its place. You can revert your hand to its normal form whenever you could normally stow a weapon. While this graft is installed, you are proficient with this weapon and can't be disarmed of it. You can't hold or otherwise manipulate a weapon, Shield, or other object with a hand that is transformed.