Arthur is a person who lived during the Epoch Era. His appearance was that of a young male human. He was fairly tall and he had long sloppy hair, with a sort of boyish face. His personality was usually fun loving and sarcastic, with a cocksure air about him. Arthur existed within the magical sword known as Illumois, inside a small meta physical realm that contained a warm wooded spring. How he came to live within the sword is still unknown.
Arthur maintains the ability to temporally slow down time. He can also switch places with whoever is welding Illumois at the current time. Arthur was discovered after a young adventurer named Annie Zephyris found the sword within a hidden temple within the Lost Woods. Since then he has been accompanying her, teasing her, talking to her in secret, and occasionally helping her out in combat.