You perform a magical surgery to reattach a piece of the Body to a target that is not Dead or a Body that had Gentle Repose casted before 10 Minutes Passed. Alternatively you may attach a different Body Part of the same type (Hand to Hand, Leg to Leg, ETC) and gain the abilities of the body part if any (DM Discretion). Tails may be attached to a creature not originally having it as well as Wings but will not gain a Fly speed.
The Target must make a Constitutional Saving Throw (DC Determined by DM) the Body Part successfully attaches regardless of results. On a Success nothing else happens on a Fail the target must take 2d6 (Damage Increases at Higher Levels) Physic Damage and fall unconscious for 1d4 - 1 Hours (0 = Half Hour)
A Creature can only have a number of modified Body Parts equal to Half the Creatures Constitution Modifier rounded Down and based on the level the spell was cast (Minimum 1) (At 2nd Level Maximum of 1).
At 4th Level: Damage Die Becomes 4d6 and Maximum Modified Parts becomes 2
At 6th Level: Damage Die Becomes 6d6 and Maximum Modified Parts becomes 3
* - (Body Part that you want to Attach)