The Legend of Lumina and Cherog

The Battle of the Energies ended when Lumina and Cherog met on the battlefield and formed an uneasy peace. Folklore likes to tell that they fell in love, but the more enlightened believe that their union was more political and bestial.
A Temple was built to honour the newly reached equilibrium. They descended and lived together therein for many centuries.
However, at some point, Lumina discovered she had conceived a child with Cherog. Fearing for the future of her offspring and suspecting Cherog wished to use the child for his own ends, Lumina decided to act to protect it. She tricked Cherog into another realm and sealed him there, closing the rift and binding it to the balancing pact to maintain the equilibrium of the Energies and Elements.
When the child was born, she named it Ffiona. Ffiona was the first of the Tiefling race. Lumina taught Ffiona to use her innate powers to hide her true appearance. Legend has it she appeared as a woman with flame-red hair. Local folklore suggests that her descendants still live in Ornblake.
This was proven true on the discovery that Nieve Tollund is a direct descendant.