Amatsumikubo

Amatsumikubo, also known as the ancient enemy or the god of all evil, is the brother of Tanacātēlatani. He grew jealous of her work and creations and sought to steal her work as his own. From the elves, he made the drow, from the dwarves the Duergar. Gnomes he turned into kobolds and halflings into goblins. From men, he made the orcs. Yet his greatest achievement was the creation of the chromatic dragons. The evil counterparts to his sister's guardians of civilisation. Yet her sister could not stand the slight and went to war over the corruption of her creations.

The war would last for nearly a century and Amatsumikubo easily won from his sister. Where as her races were made to create and build. His specialised in destruction. The war effort only turned when his sister killed herself to split herself into many smaller deities. Amatsumikubo refused to sacrifice himself to win and his forces were slowly driven back till eventually he was beaten. Facing eternal imprisonment he finally did the thing that he had been refusing to do for much of the war. Split himself in many smaller parts. Some of his fragments merged with the gods present, killing them and mixing with them to create something new and more powerful. Other parts escaped and became deities. Yet most of his fragments were imprisoned on other planes. However this would prove to be a fatal mistake as in the decades that followed the evil divine essence would corrupt the planes. Thus the abyss and nine hells would be born.

Known fragments of Amatsumikubo are: The event where Amatsumikubo split himself into fragments and the destruction it caused later became known as the Godfall and is considered the starting point for modern history. With the time before that being so filled with great magics and heroic stories it is impossible to tell truth from fiction.
 * Beru, the Lord of Storms
 * Fener, the Boar of War
 * The Reaper