Mechataur, a character in "The Crown & The Flame" series, is the mechanical guardian of the Technocrat's labyrinth. It is first seen in Book 1, Chapter 12.
Mechataur is made of metal. It has yellow glowing eyes and horns like a bull.
Whitlock created the Mechataur specifically as a guardian in the Foundry's labyrinth. He later reprogrammed him for use in more conventional battles. Since the Mechataur used conventional means of fighting, Whitlock didn't see a problem with the construct being used as a weapon, since it was essentially a repairable soldier.