Completing the Edit 2
The floating island glitch is one I already mentioned, where Damia's temple will be available right after the nursery, but the cutscene will still play normally once you beat Tiamat in the volcano. And if your character disapeared, it's not a glitch, it means you pressed "q" (someone pointed that command ages ago). To make them reappear just press "w", it's the same button to fastforward dialogs