This download is a self extracting installer including all you need to host and play Exterminatus - Rival Species 2. Three Species: Imperium, Tyranids and Chaos. Eighteen distinct classes, each with their own weapons. Nine maps from the 41st millennium, each with their own missions and objectives. Alpha 8.64 features a new chaos space marine class the Saw Bones, which fills the healer class gap in the CSM line up. The chaos Weapon Specialist now has a custom player model.