Paizo reveals Secrets of the Swarm, new Starfinder 2E Adventure Path

Paizo is pushing Starfinder 2E past launch with a mid-tier campaign built for groups that are ready for a real escalation. Secrets of the Swarm drops player characters into Krethiskar, where the Swarm has already smashed the planet’s defenses and is turning it into a hive, giving GMs a clear wartime objective: stop the world from being remade before the invasion locks in.

The 144-page hardcover arrives in stores on September 2, 2026, with a standard edition priced at $49.99 and a faux-leather special edition that adds metallic deboss cover elements and a bound-in ribbon bookmark. Paizo says the book supports a complete campaign for characters of levels 6 through 10, which puts it squarely in the space between early Starfinder 2E survival and the deeper, more dangerous tier of play. The hardcover is written by Kate Baker, Joan Hong, Letterio Mammoliti, Matt Morris, Dennis Muldoon, Emily Parks, and Sam W Tennyson.

That campaign framing matters because Paizo is using Secrets of the Swarm as more than a story book. The adventure path includes a rules appendix with new playable ancestries, magic items, and monsters, so the release feeds both sides of the table at once: the GM gets a full invasion arc, and players get new options tied directly to the campaign’s scope. For groups that want Starfinder 2E content that feels like it belongs on the table right away, this is the kind of expansion that strengthens the whole line, not just one adventure.

The book also fits into a faster rollout Paizo has already been building. Starfinder Second Edition launched at Gen Con 2025 with Starfinder Player Core, which introduced 10 ancestries and six character classes, and Paizo later marked Starfinder Alien Core in November 2025 as another major milestone. At Gen Con 2025, Paizo said Starfinder Society drew nearly 600 tables and nearly 6,000 players, a sign that the edition already had an organized-play footprint before this new Adventure Path was announced. Paizo has also said Starfinder Second Edition is 100% compatible with Pathfinder Second Edition, making the line easier to cross over for existing tables.

Paizo’s organized-play update in August 2025 said non-scenario Starfinder 2E adventures will not receive chronicle sheets, which points Secrets of the Swarm toward home campaigns and retail play rather than Society credit. Taken together, the release shows Paizo is not just shipping rulebooks and classes. It is building a campaign pipeline for Starfinder 2E, with Krethiskar now standing as the next major battleground.