Demon Rush unfolds in a world where magic has long been forgotten—until the Archangel Michael descends to Earth, determined to defend it against an impending demonic invasion orchestrated by Lucifer himself. After millennia of slumber, Lucifer awakens and unleashes a monstrous abomination to capture Michael, intending to harness the archangel’s divine energy to break free from the infernal prison of Hell. To succeed, he must reclaim the nine lost pages of the Grand Compendium—a legendary grimoire once used by the Archangels to forge Hell and imprison him within it.

As demonic forces descend upon Star City, two 18-year-old friends—Soren Eyer and Rush Cohen—are violently separated amidst the chaos and conscripted into opposing sides of the oncoming war for humanity’s fate. Soren is rescued and apprenticed to Az, a powerful templar of the forgotten Holy Knights, who trains him in the sacred magical art of Imperium, the divine energy that flows through all humans. Az believes Soren may be the chosen one, destined to lead a new order of Holy Knights—especially after Michael, moments before being dragged into Hell, entrusts Soren with his sacred sword Aethernus, which transforms into a golden feather.

Meanwhile, Rush is abducted by Karner, a ruthless warlock, and thrown into brutal trials designed to forge him into the ultimate dark warrior. After outwitting and defeating a demon with his quick reflexes and strategic thinking, Rush is taken to Limbo, a realm between worlds, where he must survive increasingly savage battles. Each time he slays a demon, he absorbs their Imperium, gaining strength, speed, and new powers.

As his trials escalate, Rush is sent by Karner to investigate a lead on the Grand Compendium. His search brings him into contact with The Black Hand, a feared syndicate of dark magic users linked to his father’s mysterious past. During a tense meeting, they reveal a shocking truth: his father may still be alive. They lead him to Nolan Bates, an eccentric billionaire who holds a vital clue to the Compendium’s whereabouts.

Now, Rush is caught between loyalty, vengeance, and survival. With his mother gravely ill, his father missing, and Karner pushing him toward even deadlier challenges, Rush must scour the Earth for an artifact that may not even exist—while Soren prepares to lead the final stand against Hell’s uprising.