Cloaker

While in Bright Light, the monster has Disadvantage on attack rolls.

The monster makes one attack and two attacks.

. . If the target is a Large or smaller creature, the monster attaches to it. While the monster is attached, the target has the Blinded condition, and the monster can't make Attach attacks against other targets. In addition, the monster halves the damage it takes (round down), and the target takes the same amount of damage.
The monster can detach itself by spending 5 feet of movement. The target or a creature within feet of it can take an action to try to detach the monster, doing so by succeeding on a DC Strength (Athletics) check.

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The monster casts the Mirror Image spell, requiring no spell components and using Wisdom as the spellcasting ability. The spell ends early if the monster starts or ends its turn in Bright Light.

Wisdom Saving Throw: DC , each in a -. Emanation originating from the monster.
Failure: The target has the Frightened condition until the end of the monster's next turn.
Success: The target is immune to this monster's Moan for the next 24 hours.