From D&D Wiki
|This material is published under the OGL|
Large aberration, chaotic neutral
Damage Transfer. While attached to a creature, the cloaker takes only half the damage dealt to it (rounded down) and that creature takes the other half.
False Appearance. While the cloaker remains motionless without its underside exposed, it is indistinguishable from a dark leather cloak.
Multiattack. The cloaker makes two attacks: one with its bite and one with its tail.
Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 10 (2d6 + 3) piercing damage, and if the target is Large or smaller, the cloaker attaches to it. If the cloaker has advantage against the target, the cloaker attaches to the target's head, and the target is blinded and unable to breathe while the cloaker is attached. While attached, the cloaker can make this attack only against the target and has advantage on the attack roll. The cloaker can detach itself by spending 5 feet of its movement. A creature, including the target, can take its action to detach the cloaker by succeeding on a DC 16 Strength check.
Tail. Melee Weapon Attack: +6 to hit, reach 10 ft., one creature. Hit: 7 (1d8 + 3) slashing damage.
Moan. Each creature within 60 feet of the cloaker that can hear its moan and that isn't an aberration must succeed on a DC 13 Wisdom saving throw or become frightened until the end of the cloaker's next turn. If a creature's saving throw is successful, the creature is immune to the cloaker's moan for the next 24 hours.
Phantasms (Recharges after a Short or Long Rest). The cloaker magically creates three illusory duplicates of itself if it isn't in bright light. The duplicates move with it and mimic its actions, shifting position so as to make it impossible to track which cloaker is the real one. If the cloaker is ever in an area of bright light, the duplicates disappear.
Cloakers earned their names for the resemblance they bear to dark leathery cloaks. Lurking in remote dungeons and caves, these stealthy predators wait to slay lone or injured prey stumbling through the darkness.
Camouflaged Lurkers. Like a stingray, a cloaker's body is composed of cartilage and muscle. With its tail and fins unfurled, it flies through darkness and lurks among the shadows of caverns the same way a stingray glides through water and hides on the ocean floor. Parallel rows of round, black eyes pots run along its back like buttons, and the ivory-colored claws on its cowl resemble bone clasps.
Opportunistic Predators. When hunting, cloakers glide through the shadows at a safe distance behind groups of other creatures traversing the Underdark. They follow parties of humanoids to prey on the wounded after a battle, or pursue herds of Underdark beasts, attacking the sick, the weak, or the straggling.
Haunting Moan. Cloakers' thoughts are alien to other life-forms, and they communicate with one another through subsonic moans inaudible to most creatures. At higher intensities, a cloaker's haunting moan becomes audible, evoking sensations of doom and dread in creatures that hear it.
Cloaker Conclaves. Cloakers prefer isolation, but they sometimes convene with other cloakers for defense or to exchange information about new dangers, suitable hunting grounds, or developments that might affect their habitats. When this convergence is complete, the cloakers separate again.