Contortionist. The manes can move through a space as narrow as 1 inch without expending extra movement to do so.
Sickening Vapors. Constitution Saving Throw: DC 12, each creature in a 5-foot Emanation originating from the manes at the end of the manes's turn. Failure: The target has the Incapacitated condition until the end of its next turn. Success: The target is immune to this manes's Sickening Vapors for 24 hours.
Claw. Melee Attack Roll: +4, reach 5 ft. Hit: 5 (1d6 + 2) Slashing damage plus 5 (2d4) Necrotic damage.
Shadow Stealth. While in Dim Light or Darkness, the manes takes the Hide action.