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This download includes all you need to host and play Exterminatus - Rival Species 2. Three Factions: Imperium of Man, Tyranid HiveFleet and the Chaos Legions. Eighteen distinct classes, each with their own weapons. Thirteen maps from the 41st millennium, each with their own missions and objectives.

The downloads on this page are the latest, stable, version of the mod.


This self-extracting installer is the recommend way to install Exterminatus, if you already have Steam installed it should automatically install the mod to the correct path.

7 Zip

This 7 zip archive should allow players or server operator who cannot use the self-extracting installer. You may need 7zip to open and extract this archive, you can download it for free from

What Next?

If you are not sure what goes where try the Getting Started section of the Manual.

Alternative Chapters

Fans of particular space marine chapters may prefer to see them in-game, rather than the Blood Ravens that come with EX as default. Installing one of the following skin packs allows you to play as these other chapters. (17,703KB) (18,625KB) (15,458KB) (16,491KB) (15,412KB) (18,807KB) (17,761KB) (24,312KB) (15,206KB) (17,593KB) (17,838KB)

Chapter Pack Installation

  1. Locate your "ex" folder, this will usually be C:\program Files\Steam\SteamApps\SourceMods\ , but can vary depending on your Steam installation.
  2. If you already have an "ex/custom" folder delete any chapter pack folders inside it. You can only install one chapter pack at a time.
  3. Extract the "custom" folder from the zip file inside your "ex" folder.

Custom Chapter Packs

If your favorite chapter does not have it's own package above you can make your own custom chapter pack by downloading the Imperial Skin Templates and following the instructions in the readme file. You may need 7zip to get started, you can download it for free from


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