Bloodsucker

Invisibility. The bloodsucker gains the invisible condition if it is further away than 10 feet from any hostile creature.

Multiattack. The bloodsucker makes two attacks, only one of which can be a tentacle attack.

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one creature. Hit: 6 (2d6 + 3) slashing damage. Instead of dealing damage, the bloodsucker can grapple the target (escape DC 13).

Tentacles. Melee Weapon Attack: +5 to hit, reach 5 ft., a creature that is grappled by the bloodsucker, incapacitated, or restrained. Hit: 6 (2d6 + 3) piercing damage plus 7 (2d6) necrotic damage. The target's hit point maximum is reduced by an amount equal to the necrotic damage taken. The reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.

Stealthy Predator. The bloodsucker can take the hide action as a bonus action.