Phoenix is a ranged character. His primary attribute is strength. The hero is mainly taken as a support or hardlaner. Most effective in the early and mid game.
Phoenix's abilities make him an indispensable ally in team fights. The Fire Spirits and Supernova abilities force enemies to either retreat or take the fight on unfavorable terms. And if one of the allies is on the verge of death, Aghanim's Scepter can change this situation and get the ally back in the game. Icarus Dive allows the hero to get in the middle of the fight or outside of it. Sun Ray is another formidable weapon against enemies and a powerful supporting spell for allies, and after the purchase of Aghanim's Shard, Sun Ray can also be used in synergy with Supernova.
The energy of the Keeper's first sun resulted in a supernova explosion. Thus the cycle of birth and rebirth was created, which led to the appearance of Phoenix. This infant son of suns took terrestrial form to shine its warmth upon those who may need it most, and perhaps seize upon its solar destiny.