You may be looking for one of these pages below, all related to Nightfall:

Vespera's Nightfall (the original facility in Atlantis designed by Vespera)

Lady Gisela's Nightfall (Lady Gisela's "improved" facility based off of Vespera's Nightfall)

Book 6: Nightfall (the sixth book in the Keeper of the Lost Cities series)

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