I ran across a list of creepiest Oz creatures. It included the Yell-Maker. Round body with two eye stalks and six legs with crab claws. I thought that's really a beholder kin. I gave him a central eye that can be hidden when the maxillipeds are closed so that it can match the Frank L. Baum description. Here is a clockwork humanoid, a rosefolk, a goat, and a human fighting one. (Might still add some magic spell effect from the goat.)
Left: Big bad for my current adventure; an imprisoned doctor-wizard whose mouth and vocal cords have been removed to stop her from casting spells, but whose genius as a surgeon and pioneering magical research have saved her from from the ax. Right: The troll-cleric warden running the prison where the doctor's being held; a pupil and creation of the doctor.