The lost city of Azur was founded by the great chaos servants who once fled from the sight of phlyndir to practice their dark arts which included the manipulation of fire and lava. Their leader was known as the witch Quelana who had built the city inside a dormant volcano through the manipulation of it's lava. Legend has it that only a few servants remain as the city was overtaken by fire demons that were accidentally summoned from the practice of dark arts, and now they aid anyone brave enough to try and defeat their once great leader quelana who had become half demon/insect and ruler of the city.
Those who face quelana have the choice of swearing their allegiance or defeating her. By swearing one's allegiance, one gains the ability to use and manipulate fire and lava.