Teramelle was a unicorn that tried to heal Gawaine but did not succeed. When Gawaine fell into a deep sleep, Teramelle, in despair, laid down to die next to the burial place of Gawaine. 

Many years later, Teramelle awakes with Gawaine, but is infused with dark fire, turning her black. She jumps into the Fire Eternal and creates an Ix inversion.