Yt-MejKot

The Yt-MejKot (pronounced yit-mej-kot) is a monster found only in the TzHaar Fight Cave. It appears first in wave 15. It resembles a very tall, lizard-like humanoid. Its melee attack is a powerful slash from its claws that hits up to 280 life points. The Yt-MejKot also has the ability to heal both itself and any other monsters around it once the targets drops below half health.

These are large monsters, and are easily blocked by other monsters or the rocks in the cave. Yt-MejKots appear to only heal themselves whilst in combat, so it is very likely they will not heal at all if you are ranging them from a safespot. They can be used to heal on if guthans is brought do to the fact they recover their hp using their ability.

Trivia

 * Before the graphics update of all the Fight Cave monsters, its appearance was similar to a lizard in a robe (like below monster table), and it used a punching attack.
 * Yt-MejKot, in the Tzhaar language, could be translated as "Cold-Mage-Protect" or "Dead-Priest-Save". "Yt" in TzHaar is cold, freeze, or dead. Yt-MejKot looks like a lizard, and lizards are cold blooded. "Mej" means priest or mage. In this case, it's probably a priest as the examine info is "Holy Reptile...". "Kot" means save or protect. Yt-MejKot heal themselves and other nearby Fight Caves creatures, so they are protecting and saving them.
 * Ava's attractor, along with Ava's accumulator, have effect on this monster. However, this monster uses 4x4 tiles so finding the right spot where Ava's device will work requires some experience.
 * They seem to heal themselves every 2 attacks they use.