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. Eleven maps from the 41st millennium, each with their own missions and objectives. Alpha 8.77 features a new weapon combo for the chaos aspiring champion, a complete re-work of the CSM heavy bolter and some very big guns for csm_trench.