Atropos and Lachesis, two out of the three Isles of Moira, were once ruled by two sisters, princesses named Korkyra and Pleiani. One of them dedicated herself to the Moonweaver, the other to the Starsinger. They feuded constantly over which saint was superior, going so far as to sacrifice each others' favorite servants to please their preferred god. Sehanine and Corellon delighted over watching them quarrel, but eventually Umberlee, who could hear everything said within earshot of the sea, tired of the bickering. She asked Sehanine and Corellon if she could put an end to the mortal sisters, but the Moonweaver and the Starsinger were aghast at the idea of destroying their two most loyal devotees. They said that Umberlee could destroy Korkyra and Pleiani only if the princesses committed an unforgivable offense.

Umberlee puzzled over this, before coming up with an innovative solution. She disguised herself as a mortal, appearing first to Pleiani in the guise of a Starsinger priestess, and then to Korkyra in the guise of a Moonweaver princess. She told both that to please their god, they must sacrifice their younger brother, a youth named Katharos. Both jumped at the chance to curry favor with the object of their worship. When Sehanine and Corellon saw that the princesses were willing to kill their own family to earn godly approval, they agreed with Umberlee and allowed her to flood the palaces of both princesses.

The servants, townsfolk, and young Prince Katharos were all delivered from their doom at the hands of Umberlee by Corellon and Sehanine themselves, who sent two chariots—one drawn by silver deer, another drawn by golden oxen—to take the people to safety. The princesses, who rejoiced that their gods had delivered them from a terrible fate, attempted to board the chariots as well, but when they did so, the beasts of burden stomped the blasphemous women to death with their hooves.

After the flood subsisted, the palaces of both sisters were restored by the townsfolk, to remain standing but never again be inhabited, as reminders of the price of displeasing the gods. There they stand to this day.