The term 'Beast Tribe' was coined not by Garlemald but Ul'dah's Syndicate.

The Prima Vista was designed at Solus' behest by one of the few Beast Men permitted to live in Garlemald's capital. Namely someone called Baku, for an additional reference to FFIX.

The Sirensong Sea was a Radz-at-Han penal colony. Apparently it fell to the undead siren we fight there who, in turn, began luring others to the island to add to the ranks of undead.