Biology
It is said that the progenitors of elemental fire themselves created an offspring that could carry forth their visions of flame into the future: Fenix. A Fenix, though at first appearing as a massive fireball screeching across the sky, is in reality a large fire bird, distinguishable by its impressive head crest and expansive wingspan. Its feathers shimmer across the light spectrum, representing the many different forms fire can take.
So rare that even the most devoted Disciples are unlikely to see one, a Fenix only answers the call of a true master of elements. Wielding no weapons but heat itself, a Fenix can vaporize most foes with a single breath of fire, augmented by arcane energies. The same energies give Fenixes the ability to melt threats before they get close enough to do much damage.