This download is a self extracting installer including all you need to host and play Exterminatus - Rival Species 2. Two Species: Humans and Tyranids. Thirteen distinct classes, each with their own weapons. Nine maps from the 41st millennium, each with their own missions and objectives. Alpha 8.56 features a selection of tweaks to the Barbed Stranger weapon, Spore Mine and Plasma particle effects and the map ex_fortress.