He is a giant rat with a body of a bison and a long tail.
Muro can command a swarm of rats.He is fast and strong. Muro can use his tail to whip at his victims and can scratch them using his paws.
Muro had already killed a villager named Raymond. Tom encountered him in the Kayonian plains after he,Elenna and their animals companions escaped from the villagers under Velmal's control.After some battles Tom cuts off Muro's tail so he can take the jade ring. Muro is then defeated.