The Uccello di Fuoco, known as the Phoenix or Firebird, is a mystical cosmic enigma central to the narrative. Possessing immense power, its blood rejuvenates life and grants immortality, coveted by political figures seeking to heal a dying Earth. During confrontations, the entity morphs into monstrous forms—dragons, tentacled leeches, planetary masses—demonstrating its formidable, elusive nature. Later, it adopts a more feminine, peacock-like appearance aboard the spaceship to communicate telepathically.

This being subjects the protagonist to extreme trials, culminating in the destruction of his robotic companion Olga. This act ignites the protagonist's emotional growth, forcing recognition of his prior selfishness. Moved by his selfless love for living creatures and profound grief, the entity revives Olga, demanding the protagonist's love in return. It then inhabits her restored form to directly experience this emotion.

The entity offers the protagonist personal immortality but honors his choice to sacrifice his life for Earth's revival. This sacrifice triggers planetary rebirth: the protagonist transforms into an infant while Olga becomes a human woman, embodying renewal's cycle. The entity's actions manifest themes of karmic consequence and spiritual transcendence, positioning it as a force bridging destruction and rebirth.

Its role extends beyond physical conflict, standing as a living prophecy that unmasks human greed and reveals redemption through self-sacrifice, ultimately guiding the narrative toward ecological and spiritual restoration.