Cloaker

Cloakers are intelligent creatures that dwell underground and resembled large flying manta rays when active. At rest, they looked like a black cloak, hence their name. Although they're usually found in a flock of twelve or fewer individuals, they were thought to have built the Underdark city Ikemmu

Cloakers often wait in ambush for their prey and generally attempt to engulf an opponent with their wings. They also have the ability to emit a subsonic moan which causes fear or nausea in opponents and can shift shadows to conceal themselves or create a mirror image.