Tengen

Tengen (天元) is a character in Jujutsu Kaisen.

History
Once every 500 years Tengen must merge with a compatible Star Plasma Vessel; this resets Tengen's immortality technique. If his technique is not reset Tengen will no longer be human, and will ascend to a higher state. Tengen would lose his will, and may become an enemy to humanity.

Abilities
The barriers that protect Jujutsu schools, the pillars of the Jujutsu world numerous auxiliary manager's barrier techniques are all strengthened by Tengen.