Titans of the Fire

Crematis the Sky-Fire, the End and the Beginning, forged the Titans of Fire. Bright and flickering beings, these titans existed in cycles, brilliant and blazing, then dim and quiescent. After time began, these cycles intensified; each life would build to an exquisite moment of glory, after which the titan would regress to a kind of full-grown childhood and begin to build to another apotheosis.
The high titans of fire were the Sparkcatchers and the Flamesmelters, towering figures of flame who fuelled and worked the forges of the sky cities, building through each life towards the production of a final masterpiece. Once great works of art, more and more with each year of war, these works instead were new weapons, terrible in their beauty.
Other titans of fire had no such definite form, their flame burning free as firestorms and auroras. Greatest of all was the heedless, immortal conflagration known as the Phoenix, itself a living weapon, more devastating, yet more beautiful, than any work of the Flamesmelters.
The Colossus War brought and end to every ceaseless cycle of fire, consuming that which by consuming should have been born anew. The forges passed into the keeping of the Flamesmelters' assistants, the fire Giants, and when the last sparkcatchers fell, grew cold unless fed with mortal fire.
Now, only two immortal flames remain. Azar Azar, last of the volcanic titans, smoulders in the heart of the Firestone Mountains, pure fire long-since polluted by the lies of Apyris, slow and bloated on the placatory worship of the pyranoi. Since the fall of Anur-tek, Azar Azar has not burned bright, but the cycle must reach its apex at some time. The other is the Phoenix - the original, the definite article - criss-crossing the World as its flame wanes, before flaring bright again, too terrible to ever be destroyed.