The Song of Selûne was a legend about the goddess Selûne the Moonmaiden.
The story began with Selûne growing tired of life in her own plane. Thus she "borrowed" a wand of great power from a god known only as "her father" and, using the wand, she traveled to a far-away plane with a forbidding blood moon.
There, she was smitten by a mysterious and attractive fighter. The stranger tricked her into transporting him and his followers to Faerun, and then he revealed his true form—he was the monstrous Imgig Zu. He and his people were hideous monsters now capable (and with the intention) of killing the deceived goddess. Fortunately, help arrived in the form of a young wizard. Although the wizard was not powerful enough to defeat the monsters, he was capable of causing enough confusion and chaos that Selûne could escape.
The goddess, now freed from her subjugation, used the only thing she had left: her own life force. Draining her life force away, she imprisoned the monsters inside a gigantic moonstone. However, the price of victory was great. By using her life force, Selûne weakened herself and sacrificed her youthful vitality and beauty. She left the gem, now known as Selûne's Eye, with the young mage who'd rescued her for safe keeping.
The story had a few alternate endings:
- Selûne went back to her home, and brought the young mage with her.
- Selûne died because of her sacrifice, but is resurrected come the next full moon.
- The young mage loved her, but she rejected his advances because she was no longer young or beautiful.
Luna, proprietress of the Selûne's Smile inn in Waterdeep, and in truth the goddess Selûne herself, told the tale as a bedtime story for Conner's son in 1357 DR. Events proved the tale to be almost entirely true, as Imgig Zu sought to release his people from the Selûne's Eye gem.