The opening scenes of Underworld 6: Shadowborn thrust us into a broken world where the uneasy truce between vampires and lycans has collapsed. In the shadows, a new threat rises: the Shadowborn, a mysterious breed of creatures born of darkness, able to shift between corporeal and shadow forms. Their arrival awakens instincts long buried in both clans, and the fragile balance of power is upset once more.

Selene, now older and haunted by years of turmoil, senses something inhuman stirring in the borderlands between the two races. She has retreated into semi‑isolation, but when hybrid children begin disappearing from both vampire and lycan territories, she is drawn back into the fray. Her mission is no longer just revenge or survival — it is uncovering the truth behind these Shadowborn and stopping them before they overrun the night.

In parallel, Lucian’s heir, Alaric, commands a lycan faction that seeks retribution for past betrayals. Alaric is skeptical of alliances with vampires, but as Shadowborn attacks grow bolder, he must consider an uneasy cooperation. His leadership is challenged by hardliners who see any deal with Selene’s people as treacherous. Amid this tension, Alaric secretly meets Selene and proposes shared intelligence — though neither fully trusts the other.

As Selene and Alaric delve deeper, they discover ancient texts pointing to a primordial darkness beneath Earth itself, where the Shadowborn were first formed. The texts hint that the Shadowborn are not mere monsters, but corrupted offspring of vampire and lycan blood, twisted by forbidden magic. If the root of their power is tied into the Corvinus line, then all bloodlines are implicated, and Selene’s past becomes central once again.

Battles erupt across ruined cities and moonlit forests as Shadowborn infiltrate covens and wolf packs alike. Selene leads a small band, including familiar allies and new characters, into hidden caverns beneath the old world. Alaric leads his own, among whom some defect, believing the Shadowborn to be a path to vengeance. The stakes rise when Selene is captured and experimented upon — the Shadowborn seek to remake her.

In the film’s climax deep in the caverns, Selene, now partially transformed by the Shadowborn’s magic, fights to reclaim herself. Alaric leads a rescue, bearing the sacrifice of his own pack. Together they confront the Shadowborn queen, a being who reveals that her origin lies in a forbidden union of old vampire‑lycan magic. The battle merges physical combat, shapeshifting, and darkness itself. In a final act, Selene sacrifices part of her soul to destroy the queen’s core, triggering a collapse of the caverns.

When the dust settles, many are lost. Selene emerges wounded, Alaric at her side. The truce between vampire and lycan is renewed — but forever changed. Shadows retreat but linger in whispers. Underworld 6: Shadowborn ends not in clear victory, but with a sense that darkness always watches, and that to preserve the night, some lines must be redrawn.