Skulk Skeletons

A very special variant of skeleton caused by a skeleton spawning in a skulk biome. The skele-skulk will appear gooped-up, with skulk growths on it, and similar to the Warden, will not be able to see you. They have echolocation, and after a short amount of time will rasp, and from that identify your location if you are not behind blocks. They would shoot arrows of blindness, or perhaps deafness, in order to make you weaker.