Guymelefs are large, humanoid machines featured in the anime and manga series The Vision of Escaflowne. They are often piloted by characters and serve various purposes, including combat and transportation. Each Guymelef is uniquely designed, reflecting the personality and skills of its pilot. In the series, Guymelefs are powered by a mystical energy source called Zarathustra, which enhances their capabilities. The machines play a crucial role in the conflicts between different kingdoms, showcasing advanced technology and magical elements that are central to the story's plot.