"After turning himself into a Lich, Berlaint received an invitation from the Undead Council. He went along and became a member, then completely vanished from the face of Elasia.
It was only three hundred years later that he resurfaced to the world, this time as a legendary Lich.
But, even as a legend, he was still obsessed with our Dragon Race. However, he was no longer fixed on taming the living Giant Dragons but instead became fascinated with the Bone Dragons and Ghost Dragons. He believed that they were the ultimate works of art among the undead.
As a result, just after becoming a legend, Berlaint massacred the Five-Colored Evil Dragons scattered across the world, obtaining materials to create Bone Dragons. After killing the Five-Colored Dragons who were not yet legendary, he also imprisoned their dragon souls for the creation of Ghost Dragons.