Held in duress for aeons within the lesser moon, Dalamud, the elder primal Bahamut broke free of his captivity when the celestial body was wrested from the heavens to descend upon the Battle of Carteneau. Once freed, the terrible being wrought fiery destruction across the length and breadth of Eorzea, his devastating rampage marking the beginning the Seventh Umbral Era. In the midst of the chaos, however, Bahamut was enveloped in a blinding white light and abruptly disappeared from the skies. None claim to have seen the primal in the five years since.
I wasn't aware of this. I thought we were still speculating about what happened to him. Obviously, we know he's in his lair, but I didn't know it happened immediately after old man Elezan mage guy warped us.