Spell Master: Zenjuro is a very well known spell master with many recognizing his abilities with handling a demon's power. His control of his demonic powers is much greater than Oga's, and he can gauge the amount of energy he wants to use with precision, as seen by the fine control he has over the size and expansion of his own tattoo. Zenjuro is also responsible for educating the the top two members of the Three Beasts within the Killer Six Elements that led them to possessing phenomenal powers for humans and had also trained Oga into being competent enough to fight against the demons of the 34th Pillar Division. He is so powerful that Behemoth also mention that there will be many casualties should their division clash with him. Due to the amount of power he can use and the shape of the seal, it is reasonable to assume that he has formed a contract with a demon from the royal family. Due to their respective ages, he may be contracted with the Demon King himself. During the fight against the Solomon Company, Zenjuro demonstrated the ability to casually defeat other spell masters as well.