Bahamut Au, The Doom Bringer

Among the most powerful of all known Eidolons in existence. Said to take the form of an ancient god that thrived on destruction and chaos in a time long before civilization took its place in history. There are only myths, and tales that are told about these beings. Their power immense, nigh, unmatched. Their souls lay trapped within powerful magical devices to be summoned by only the most powerful of mages and summoners. They are scattered throughout the universe far and wide. Guarded by the most powerful magical wards. In tales of legend, these creatures are said to have been able to turn entire worlds to ash in the blink of an eye. Though few, if any, have ever bare witness to this.