Flesh Symbiont, Hand

Wondrous item, uncommon
  Crafted by Thumblemore the wizard, this cursed lump of dormant flesh needs a host to emerge from its slumber. Over the course of an hour, it slowly attaches itself to the stump of your lost hand, shifting hue and morphing its shape to represent your previous hand. The results aren’t always perfect; roll 1d6 + 1 to determine the number of digits your hand will have. The first digit is always a thumb and a mouth forms in the hand’s palm.
  Cost. The symbiont feeds off of you, siphoning your magical energy. When you complete a long rest, you must make a DC 10 Constitution saving throw. On a failed save, you lose one spell slot of your lowest available slot level.
  Mockery. You can use the hand to cast vicious mockery cantrip at will, the save DC equals 11 plus your proficiency bonus. If the target succeeds on it saving throw, the mouth blurts out insults and mockeries at you, causing you to become ‘timorous’. While timorous you make attack rolls with disadvantage. If you hit with an attack roll, you remove this condition.
  Alternatively, as a bonus action you can punish your insolent hand, taking 1d4 + 1 bludgeoning damage, and restoring your sense of self-worth, removing the ‘timorous’ condition.
  Symbiotic Nature. The symbiont can’t be removed from you while you’re attuned to it, and you can’t voluntarily end your attunement to it. If you’re targeted by a spell that ends a curse, your attunement to the symbiont ends, and it falls off, reverting to a dormant lump of flesh.