Sins of a Solar Empire II: Harbinger expansion reveals new Eidolon faction

The Sins of a Solar Empire franchise is about to get its fourth faction, an addition that fans have been waiting for two decades. The Harbinger expansion from Stardock for Sins of a Solar Empire II now has a release date attached to it too, with it slated to land on September 3, 2026.

"The Vasari have been running for nearly 10,000 years from the 'great threat' that destroyed their empire," says Stardock. "For 35 years, they’ve warned anyone who would listen about it drawing near…. Now, they have arrived: the Eidolon."

Instead of fighting for planets, trade routes, or wealth, this new faction is focused on spreading corruption and striking its foes with cloaked fleets. The more that corruption spreads across planets and units, the more power and advantages that the Eidolons gain.

"The Eidolon don’t value typical assets like other races, but they do exploit them as a way to spread their corruption more effectively," adds Stardock. "They seek only to corrupt those they encounter, transforming them into something else to empower themselves."

Check out the announcement trailer for the Harbinger expansion below:

“Sins of a Solar Empire fans have been waiting for this reveal for a very long time,” said Brian Clair, Director of Publishing at Stardock. “The team has been focused to make sure we don’t disappoint and give players a new, unique experience.”

The Sins of a Solar Empire II: Harbinger expansion is available now to wishlist on Steam. It's also coming via the Epic Games Store and the game's own website. The expansion has a $29.99 price tag, and anyone who has purchased the $99 premium edition or the Sins of a Solar Empire II: Content Pass for $59.99 will get it for no extra cost.

Disclaimer: Neowin's relationship to Stardock