Wondrous Item, uncommon
This linden prosthetic arm has multiple slides and dials on it, with a bell-shaped wrist and pincer-like hand capable of grasping and carrying up to 10 lbs. The hand can hold a shield, bow, or other ranged or thrown weapon, but if used to attack with a melee weapon, on a successful hit, it takes 1 point of bludgeoning damage. Once it takes 2d4 points of damage, the hand breaks off.
The wrist is an opening to a small pocket dimension similar to a Bag of Holding. While wearing it, you can expend 1 charge as a bonus action to change the hand into one of the following items, ready for use: club, crowbar, crutch, dagger, fishing pole, flail, hammer, handaxe, hand crossbow, holy symbol, rapier, shortsword, spell focus, warhammer, whip, or a musical instrument no larger than 2 lbs. You must supply the holy symbol, spell focus, or musical instrument.