Tet

Race: None (Formerly: Old Deus)

Tet is the One True God of Disboard.
Tet does not belong to any of the 16 races, although the closest affiliation to him would be Immanity.
To challenge Tet for the title of the One True God, one must collect all pieces of different chess from 16 races. This means that, under the tenth rule of the Ten Covenants, one must defeat or unite all 16 races before being able to play against him.

He was born from Riku's wish and the overwhelming presence of incredible magic energy. Claiming the Suniaster and becoming the One True God, Tet immediately used his absolute power to repair the damage done to the planet and set forth the Ten Covenants, thus ending the Great War.