Shinryu, huh.

[Valmonte]

As others have said, it seems that Bahamut was put in a "temporary prison" that was meant to hold him as the 12 were summoned. Before the summoning could complete, however, Bahamut broke out of that prison and scuttled the whole thing.

I don't think it's that the 12 weren't able to hold Bahamut, but rather that they never got the chance to do their thing.

Dalamud had been absorbing aether for a long while, even weakening some of the primals. my guess is bahamut was juicing up on aether and possessed van darnus to draw his prison closer to the planet.

[Rosalie]

Dalamud had been absorbing aether for a long while, even weakening some of the primals. my guess is bahamut was juicing up on aether and possessed van darnus to draw his prison closer to the planet.

^ This very much so. If you recall when you're spamming through the primals, Louisoux mentions that it's troublesome how the aetheric energy ganked by the primals hadn't been getting absorbed back into the earth upon defeat... Bahamut was drinking that stuff in. So I blame all you people who HAD to get all seven of your totemic weapons! (j/k)

[Rustyhagun]

^ This very much so. If you recall when you're spamming through the primals, Louisoux mentions that it's troublesome how the aetheric energy ganked by the primals hadn't been getting absorbed back into the earth upon defeat... Bahamut was drinking that stuff in. So I blame all you people who HAD to get all seven of your totemic weapons! (j/k)

Seems Bahamut was sucking up all that energy like a newly charged battery. He had at least Garuda and Ifrit essence absorb, plus Ravens and with his own. Probably sucking up aether energy from the planet as well as his prison got closer the the planet. So ya he was fully charged and ready to release all that stored up anger and energy back on his enemies/planet.

2.0 is gonna be hot.... I just want my Job to come out so I can really enjoy this game. Jobs now aren't doing it for me not even summoner.