Headcanon
Maintenance
“You have come here for a reason, though you may not know what it is.”
This article or section contains ‘musings’ - developmental notes, not yet codified.
Origins
Although it is believed to be a mostly false tale, House Azura legend states that Azura herself raised the isles out of the ocean and populated them with unique life. In actuality, no amount of Azura’s power would have allowed her to change anything to such a great extent on Nirn. Read more in The Translation. The Khajiit would say “this is just like Azurah, taking credit for her littermate Nirni’s beauty.”
White-Gold Tower was made by the Ayleids, the Heartland High Elves that would have none to do with their isle-kind. Where the Altmer sought to focus on dracochrysalis, or keeping elder magic bound before it could change into something lesser (and act which ironically required aetherial surplus), the Ayleids harvested castaway creatia from Oblivion by entering a pact with the masters of the Void, the Princes of Misrule.
Link to original
Musings
Azura would also have access to creatia. Perhaps that is what she used to create Lyithdonea. If there’s any truth to the legend.