Camazotz

Pack Tactics. The camazotz has advantage on an attack roll against a creature if at least one of the camazotz’s allies is within 5 feet of the creature and the ally isn't incapacitated.

Bite: Melee Weapon Attack: +7 to hit, reach 5 ft., one creature. Hit: 11 (2d8 + 4) piercing damage, and the camazotz attaches to the target. While attached, at the start of each of the target’s turns, the target takes 13 (3d8) Necrotic damage. The Camazotz regains hit points equal to the necrotic damage dealt.

The camazotz can detach itself by spending 5 feet of its movement.

Horrid Wail (Recharge 5–6). The camazotz lets out a terrifying scream in a 60-foot cone. Each creature in that area must make a DC 14 wisdom saving throw or be frightened for one minute. The target is paralyzed while frightened in this way. A target can repeat the saving throw at the end of each of its turns.