Cthith's Servant

Joined mind. All of Cthith's servants are possessed and controlled by the infinite mind of their master. When one servant learns or sees something, all other servants gain that knowledge as well. They act in perfect harmony as Cthith is a master strategist. 

Poor disguise. These servants often look human as their wounds heal within a day of being taken. Their mannerisms are off and they don't fit into normal society without being noticed for their peculiarity. 

Multiattack. The servant makes two longsword attacks or two longbow attacks. It can use its Life Drain in place of one longsword attack.

Life Drain. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 5 (1d6 + 2) necrotic damage. The target must succeed on a DC 15 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.

Longsword. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (1d8 + 2) slashing damage, or 7 (1d10 + 2) slashing damage if used with two hands.

Longbow. Ranged Weapon Attack: +4 to hit, range 150/600 ft., one target. Hit: 6 (1d8 + 2) piercing damage.

Inky Resurrection. The servant spits some inky black fluid from it's mouth into the mouth of a corpse within 5ft of it, losing half it's hit points. The corpse rises as one of Cthith's servant with the same amount of health as their resurrector.