Amatsumikaboshi

Amatsumikaboshi is an almighty god of infinite cosmic, stellar power of the infinite cosmos who had sent two demon swords to in more ancient times of  Japan. It is implied that he may the true threat behind the Grim Comet and Degenerate Age.

History
Rion first brought mention of the god when explaining the origin of the two swords, Zanseiken and Bakuseiken. He was later mentioned by Sesshōmaru's mother when she recognized the sword her granddaughter was using.

Trivia

 * This God of Stars is based on.