Mutagen: Grappling Appendage

You grow an extra appendage from your back that resembles a tentacle. This appendage has a reach of 10 feet and can be used to make unarmed strikes, shove, and grapple. On hit, it deals bludgeoning damage equal to one roll of your Rite Die. This appendage can be used for simple tasks, but it cannot wield weapons or shields, or manipulate objects or tools. Starting at 13th level, this Mutagen grows two appendages.