A skeleton reanimated by the illithilich Scelerus
the Abhorrent. Many are actually several halfling skeletons assembled into a large amalgam, and all of the skulls have a large whole in the front cranium.
Multiattack: The skeleton makes two melee attacks.
Scimitar: +4 hit, 1d6+9 slashing damage.
Shortbow: +4 hit, range 8-/320 ft., 1d6+9 piercing
Sneak Attack (2d6).
Illithid Infiltrator: This creature is possessed by an intellect devourer.
Detect Sentience (300 feet, Int 3 or higher).
Multiattack: The infiltrator makes two melee attacks.
Scimitar: +5 hit, 1d6+3 slashing damage.
Hand crossbow: +5 hit, 30/120 ft. range, 1d6+3 damage.