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 9.05 rolls up a collection of weapon improvements and tweaks since Alpha 9.02, including balance fixes to the Sniper Rifle, Shotgun, Meltagun and Plasmagun.