One has to wonder why a maritime nation would worry about a flood... Amdapor would drown, but Nym presumably had ships... Perhaps the floating city was meant to be the hub of a flotilla? Really hope we do get a Nym raid in 3.3, I'd love to know what happened to the rest of them... Given the Scholar quests I assume they just failed to contain the Tonberry curse though, though a Tonberry Raid would be amazing... 3.5 better explore Amdapor in West Shroud, too, there has to be a reason that structure in West Shroud is so beautifully framed by the main window in Amdapor Keep...
Wait... Was Wanderer's Palace effectively air locked, or are Tonberry able to breath underwater? Given the state of the place (and fact they seem to crawl out of the water during the King Tonberry fight), I'd assume that later... Were Mhach really that bad? Oh sure, a Tonberry curse seems down right diabolical, except it apparently saved plenty of Nymian lives... The whole Rancor thing is still a bit of a problem, but Nym still came out on top of the War of the Magi thanks to the Mhachi... They knew the flood was coming, they tried to save themselves and failed because they couldn't totally control Voidsent... Who's to say they didn't try to save Nym, and the Voidsent that powered that plan isn't the cause of the problems? Or even just Nym itself... Heck... Remember what Diabolos had in XI? Dynamis. Who's to say they didn't attempt to save Amdapor by having Diabolos whisk them away to Dreamland, where they'd be safe. Our fight with him does involve him summoning doors that allow us to hide out in the Void (or something) to avoid the dangers of the physical world...
Sure, the three were at war, but who's to say the nation which realized their war was heading towards a Calamity, didn't also turn over a new leaf at that point? Shame none of them survived... Add Cait Sith to the long list of NPCs I want to interrogate, you're up there with Midgardsormr now, puss. Given Cait Sith is a familiar in the same sense as the brooms/poroggo, I can totally see a sect of Mhachi society forsaking conflict and instead opting to merely record history...