CG Midlander

[Zenaku]

http://finalfantasy.wikia.com/wiki/Seventh_Umbral_Era

So reading up on info provided from this link.


So we can assume the Allgans were destroyed by something dealing with the Earth and not by Bahamut. All that power to seal Bahamut and they lose to an earthquake

Bahamut was still a power elder primal of it's time sure titan may have been there during that time but titan is noting when it come to bahamut. Remember that it took life energy from the earth to make dalamud and seal away bahamut. They could have been left defenseless once that done that with no more energy to use they would have die by any attack. Sometime the smartest civilization die by the most dumbest thing.

That my take on that