PLAY ON ANY DOOMTROOPER IN AN OUTPOST DURING YOUR TURN. VIRUS. The warrior loses -2 to its F, S and A. At the beginning of each of YOUR Draw steps, it loses another -2 to F, S and A. Ratings may fall below 0. All Doomtroopers in the same area as the warrior for a full turn (from your Draw step to your next) will also become infected with V-3.