Tyche, a Goddess existed before the Dawn Cataclysm. She flirted with fortune and disaster, Lady Luck bestowed and withdrew her favor at a whim. This continued for Eons.
Eventually Tyche found herself embroiled, along with the rest of her circle of deities, in a war between the Gods resulting from the actions of a current paramour, Lathander. Tyche kissed the Morninglord with misfortune and wandered off to explore the Realms. Tyche was always fickle with her favours.
During her travels, Lady Luck discovered a budding rose of amazing beauty. Delighted with this, Tyche reached to pluck this delight, which she assumed was a peace overture from Lathander, who sought to regain her good graces. Lady Luck was astonished that she could not pluck the rose from its bush. She cursed the rose with bad luck, and the flower's stem broke in her hands. Tyche placed the plucked rose behind her ear and continued on her journey.
The rose was a manifestation of Moander, god of corruption and decay. The severed rose stem crept into Tyche's ear and began to rot her from the inside out. Lady Luck now suffered from misfortune.
Later Tyche returned home, she came across her dear friend waiting for her, the goddess Selune. Also Lathander, who wished to regain her affections, and Azuth, who had come to umpire the argument between the two. Selune wept at the corruption and rot destroying her friend from within. Instead of letting Tyche see this, Selune lashed out with a bolt of purifying light. Tyche's rotted core split right down the middle and a smaller, brighter version of the goddess of luck stepped out, allowing the goddess of the moon to save that which was good and pure in her friend. However, following this first figure from the rotten external shell was another form stunning to behold, but full of dark malice and capricious ill will. As the two emerged, they immediately fell upon each other in hate, struggling madly, and were only separated by the combined efforts of all three visitors.
It is said that Tymora, Tyche's Fair-Haired Daughter, embodies all the grace and kindness of her mother, while Beshaba, Tyche's Unpleasant Daughter, got only her looks. Since their birth, the twin aspects of Tyche - Tymora, Lady Luck, and Beshaba, Maid of Misfortune - have battled each other in a civil war that continues to this day.
Today, in the 21st Century, the struggle of good fortune and bad fortune continues. When you wish for Good Luck, you can only do this!