Throughout the Horizon series, multiple primary and secondary antagonists have been introduced. In Horizon Zero Dawn, the Eclipse cultist leader Helis, alongside the rogue artificial intelligence HADES and HEPHAESTUS, serve as the primary villains. In Horizon Forbidden West, HEPHAESTUS once again serves as an antagonist alongside villainous newcomers Regalla, Gerard Bieri, Tilda van der Meer, Walter Londra, and other alien Far Zenith. In Horizon Call of the Mountain, the Oseram Sons of Prometheus leader Asera served as the VR game’s main antagonist. While HEPHAESTUS and the alien artificial intelligence Nemesis will likely serve as the primary antagonists of Horizon 3, one lesser-known entity of the Horizon franchise may pop up to play a minor villainous role: Vast Silver.