Corrupted Ushabti

Necrotic Weapons. The ushabti's weapon attacks are magical. When the ushabti hits with any weapon, the weapon deals an extra 2d6 necrotic damage (included in the attack).

Regeneration. The ushabti regains 5 hp at the start of its turn if it has at least 1 hp.

Swarm Body. The corrupted ushabti is a spirit inhabiting a colony of scarabs around a Humanoid skeleton within funerary wrappings. It can move through any opening large enough for a Tiny scarab and Humanoid bones, and it can't regain hp or gain temporary hp, except for its Regeneration trait.

Undead Nature. The ushabti doesn't require air, food, drink, or sleep.

Multiattack. The corrupted ushabti makes two Ceremonial Greatsword attacks.

Ceremonial Greatsword. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 11 (2d6 + 3) slashing damage plus 7 (2d6) necrotic damage.

Vomit Swarm (Recharge 5-6). The corrupted ushabti exhales scarabs in a 30-foot cone. Each creature in the area must make a DC 15 Dexterity saving throw. On a failure, a creature takes 25 (10d4) piercing damage and is covered in scarabs. On a success, a creature takes half the damage and isn't covered in scarabs. A creature covered in scarabs takes 2 (1d4) piercing damage at the start of each of its turns. A creature, including the covered creature, can take its action to brush the scarabs off the covered creature by succeeding on a DC 15 Dexterity check.