Microsoft have announced the first major expansion for Halo Wars 2. Awakening the Nightmare adds a new campaign that puts players in the role of The Banished, the antagonists of the main story.

The new campaign sees The Banished having to fight off The Flood in a desperate battle of survival. The new faction brings with it new buildings, traps and a new tech tree.

Elsewhere, the expansion will add two new multiplayer maps, two new leaders for multiplayer and a new mode – Terminus Firefight. A horde-mode that pits up to three players against waves of increasingly difficult enemies.

Halo Wars 2: Awakening the Nightmare is included with the base game’s season pass, or sold separately for $20.