Crypt Thing
A crypt thing is an undead monster that first appeared in AD&D 1st edition, and returned in 2nd and 3rd, and also in a play test module for 5th edition, but never appeared officially in 5th. A crypt thing is an intelligent skeleton wearing a dark robe. Their purpose is to guard graves, and their primary ability is to teleport intruders to away, so they actually are usually not much of a challenge. While it can't teleport a victim into a solid object, they can teleport a victim into the air and let them fall, though not all crypt things are clever enough to realize they can do that. Some rare crypt things can't teleport enemies, and instead paralyze victims while turning them invisible at the same time, in order to fool the victim's friends into thinking they disappeared.