Onnotangu

Onnotangu was Lord Moon. He was the husband of Amaterasu and the father of the Kami.

Creation
Onnotangu and Amaterasu came after the three who cannot be named, and the two were a perfect match. They were tasked with creating the world and naming everything in it. One thing escaped naming however, Nothing, and it hid in Onnotangu's shadow.

The Kami
Onnotangu and Amaterasu had ten children, who they named the Kami. Because of doubts and fears whispered in his ear by Nothing, Onnotangu began to fear his children's powers. Shiba and Bayushi were concerned about Onnotangu, but Hantei forbade them to plot against him. Fu Leng, hoping to curry favor with his father, told him what they had been planning. Onnotangu's wrath was terrible.

Fall of the Kami
Onnotangu devoured all of his children, including Fu Leng. With each child he ate his wife Amaterasu fed him a cup of poisoned sake. When he came to eating the tenth child, Hantei, he mistakenly ate a stone instead. Hantei was hidden away by Amaterasu who taught him about honor, the way of the warrior and the noble man Onnotangu had once been. Hantei rose up and challenged his father. During their fight, Hantei heard the voices of his siblings. He cut open Onnotangu's belly, who in turn tore a hole in the sky. The ten kami fell to earth, where they founded Rokugan.

Onnotangu's Artifacts
With Hantei's cut, Onnotangu's blood fell to the Earth and became Obsidian. In the places his drops of blood mixed with Amaterasu's tears Jade, they became the first human beings. Hantei also severed Onnotangu's Hand, which fell to the Earth and was later discovered by the Scorpion Clan Thunder Shosuro. Shosuro also made a mirror with Onnotangu's Blood, known as the Obsidian Mirror.

Hitomi and Onnotangu
In 1132, when Hitomi's mind was clear of dark influences, she could see how to undo the damage she had wrought. She could see the entire existance of the Lying Darkness laid out before her, how Onnotangu had hidden its existence from Amaterasu. How its subtle influences had caused all of the Kami's downfall (one way or another) and its slow growth of power over the course of the Empires history. And she knew that only an enemy with equal power could defeat it. Hitomi challenged Lord Moon, collecting up powerful artifacts born of the power of the moon, making Onnotangu answer for his alliance with the Darkness. If she succeeded, she would gain the power to defeat the shadow itself. Calling Onnotangu down from the heavens she challenged him to personal combat, and his eagerness to crush her and reclaim the Obsidian Hand caused him to accept. With the powerful artifacts and wisdom of Togashi on her side, Hitomi slew Lord Moon. (3E p. 23)