Microsoft, 343 Industries, and Creative Assembly have announced a new expansion for Halo Wars 2.

The new expansion is titled “Awakening the Nightmare,” and it’s set for a release sometime this fall across PC and Xbox One. Featured above, you can view the announcement trailer for the expansion.

Here’s a brief synopsis of the expansion:

Halo Wars 2: Awakening the Nightmare is a brand-new full expansion coming to Halo Wars 2, featuring a new campaign, two new multiplayer leaders, two new multiplayer maps, and a brand-new cooperative mode, Terminus Firefight – featuring the return of the Flood!

Here are some new screenshots: