I may be recalling this wrong but I remember something about dalamud being some ancient allag superweapon. This was an early Cid quest for GC. I had assumed it was because giant doom ball/fortress, not giant weapon inside spikey prison. So I assume that Bahamut might be some kind of created hate primal thing. FF has a history of doing that with things (chaos/ship in 9/etc).

Also someone mentioned the imperial walker magitech things- they are like identical to the ones in FF6. Thats obvious but thought id point it out since as an ff6 fanboy i was like WEEEEEE.