Give Yourself a Hand #Microfeats
Give Yourself a Hand. As a result of a spectacularly unfortunate and unusual magical mishap, your left hand’s attachment to your body is optional. Under most circumstances, you and your hands function just like everyone else’s. However, you left hand can detach can function independently.
This function as the alchemist tumor familiar discovery, except the “familiar” is your left hand and is treated as a cat with a smash rather than a bite (damage based on its size), it doesn’t have scent, it does have Grab which is can use on creatures of up to your size. And it can use a single magic glove, and one magic ring, and no other magic items. Also, if the hand is not in line of sight of you, it’s blind. And while it’s gone, you don’t have a left hand (and being missing a hand doesn’t qualify as “having a hand free” for abilities that require a free hand).
While you hand is attached, there’s no sign it’s unusual and nothing short of a miracle or wish reveals its true nature. While detached, it’s a separate hand crawling about and it’s pretty obviously weird. If your hand is ever destroyed (while detached or not) it regrows in 24 hours.