They are an immortal jujutsu sorcerer that remains within their chamber, the Tombs of the Star Corridor, at all times in order to reinforce the barriers that protect both Jujutsu High locations. Master Tengen is also known as the "Star". At one time they were responsible for preaching the foundation of jujutsu sorcerers and ended up spawning religious groups that worship the Star as their deity. Tengen appears to be a well-mannered, straightforward, and knowledgeable individual.