The galaxy's energy reserves are dwindling, forcing its inhabitants to rely on unstable and destructive substitutes. The Celestial Codex, an ancient book said to contain the formula for limitless and sustainable energy, has long been shrouded in myth and hidden to prevent misuse.

Eryk discovers a fragment of the Celestial Codex in the ruins of a lost Concordian archive. The fragment leads him to a cryptic map of ancient celestial coordinates.

Pursued by Zenith assassins and Coalition agents, Eryk narrowly escapes thanks to Kairis, who agrees to help him after learning his knowledge could benefit the rebellion. Sol, drawn to the Codex’s fragment, joins them after saving their lives.