Icarus, the Phoenix

Alone across an untouched darkness gleamed the Keeper's first sun, a singular point of conscious light fated to spread warmth into the empty void. Through aeons beyond count, this blinding beacon set to coalescing its incalculable energy before bursting forth the cataclysmic flare of supernova. From this inferno raced new beacons, star progeny identical to its parent, who journeyed an unlit ocean and settled in constellatory array. In time, they too would be made to propagate through supernova flame. So would this dazzling cycle of birth and rebirth repeat until all skies hewn of Titan toil deigned to twinkle and shine.

By this ageless crucible the star that mortals would come to call Phoenix collapsed into being, and like its ancestors was thrust into an endless cosmos to find a place among its stellar brethren. Yet curiosity toward that which the dimming elders comfort in the darkness consumed the fledgling, and so over long cycles it inquired and studied. It learned that among worlds both whole and broken would soon stir a nexus of remarkable variety locked in an enduring conflict of cosmic consequence, a plane which would find itself in need of more influence than a dying sun's distant rays could provide. Thus this infant son of suns took terrestrial form, eagerly travelling to shine its warmth upon those who may need it most, and perhaps seize upon its solar destiny.

Trivia
Phoenix's real name in DotA was Icarus; in Dota 2, his name was removed for unspecified reasons. However, as he was not given a new name in Dota 2, we have decided to temporarily adopt his DotA name, for easy reference.