The Cataclysm of Ultana
The eight deities that watch over Ultana. They became the deities after they defeated the dragons over 2000 years ago.
UPDATE FROM CHAPTER 6
The Octoma were originally advisers to Emperor Achlys Protex. They were chosen because of their extreme power compared to others. This gave them a superiority complex and after advising the Emperor for several years, they were contacted by an unknown power, known only as The Deep Void, and given access to evil magic that allowed them to over power the dragons, use their hearts to become immortal, and take control of Ultana.
After assuming control and setting up the Aegian Order, they disappeared.