The Expanse: Osiris Reborn is an action RPG developed by Owlcat Games set in the universe of The Expanse — the hard sci-fi series by James S.A. Corey. You play as a Pinkwater Security mercenary who survives the protomolecule outbreak on Eros and begins building a team to fight back against Protogen. The game draws heavily from Mass Effect in structure — cover-based combat, companion commands, cinematic storytelling — while grounding everything in The Expanse’s unforgiving, politically complex universe. Earther, Martian, or Belter: your background shapes everything. Builds, guides, and our full coverage are right here.
