Stahl Arms is a multiplayer map in Killzone 3. It was released as part of the Steel Rain Map Pack. Warzone is the only game mode playable on the map.
As the Helghast write a new and appalling chapter on humanoid experimentation, beleagueredISA Forces mount a desperate attack on the notorious Stahl Arms research facility, where they hope to free ISA soldiers who have been taken captive. Stahl’s Helghast forces will stop at nothing to ensure that the ISA attack fails, even if it means exterminating the very prisoners they need for their weapons research.