As a boy, Caius lived with his foster father, Ramrus Qualls, in the small village of Feln, situated in a remote area of Areulla. Everything was peaceful until one day when a creature known as a Spot attacked, looking for Caius's crystal that had once belonged to a Black Knight. Hoping to protect the village, the young man attempts to fight off the Spots, but the monsters overpower him, eventually forcing Ramrus to change into a beast and protect his son. It is at this point that his foster father's identity as a Leymon is revealed to the villagers, who quickly called for Lukius Bridges and Rommy to take him away. Mourning over what he has lost, Caius vows revenge upon the Church and sets out to save Ramrus along with his childhood friend Rubia Natwick.