Spell of Soul-eating (식혼의 주술, Sighon-ui Jusul) is a forbidden spell, when used, the spell makes it's users become one by merging their soul. This spell was left by an ancient demon in a spell book. After Hoaqin receive the book, he studied this spell with his siblings. In the end they succeed in becoming one, and lived as one for many years. This spell caused all of them to become one entity known as White. However, Hoaqin was the only one who actually made a deal with the demon.
After the Slayer known as White was defeated by Zahard's Princess, the spell was broken and the siblings were reverted to their original form. White was driven out of his Slayer position and lost his powers due to the splitting of the souls.
In an attempt to regain his powers White boarded the Hell Express to absorb new souls. His plan was to gather as many souls as possible and then absorb them all at once. He had to do so because of the contract that he made with the Administrator. His plan failed and he was sealed in an unstable condition. The reason why his plan failed is beacuse of Roen's sacrifice. She successfully completed the spell to sacrifice her own soul, in order to seal him off forever.