It's interesting that all these powerful beings have covenants/ devine contract with each other. Makes me think that Ishagrdians broke the covenant they had with dravania; whatever that may be.

Although I kinda have a feeling that maybe dragons and zodiark predates Hydealine or are related somehow. After doing some research Sabik (the core/heart of Ultima) is a star in the Ophiuchus constellation and Ophiuchus is another name for Zodiark. Ultima also looks like a dragon.