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The Fortress of the Three Sisters was a fort in Deukalion's Heritage, Elysium. It was home to a sizeable military force and in use by the local Overseer, Aegea, queen of the Amazons during the Trojan War.
In around 422 BCE, in the simulation of Elysium created by the Isu Aletheia, the Spartan misthios Kassandra was instructed by Adonis to travel to the fortress and killed the captains and Overseer, destroyed torches of Hypnos, burned provisions and claimed their valuables. Doing all this helped the Elysian rebels weaken Persephone's control of the region.