Siege of the Citadel 2nd Edition is a reboot of Mutant Chronicles: Siege of the Citadel and is set in the Mutant Chronicles universe with each player controlling one of five corporations: Imperial, Cybertronic, Mishima, Capitol, or Bauhaus. The players must prevent the Dark Legion and one of its vile leaders from conquering the solar system. Each successful mission brings news of monstrous foes and terrifying events as the heroes explore the modular Citadel. Promotion gives credits to access more powerful weaponry and abilities, while secret missions can cause chaos for the heroes!
The narrative-led design of Siege of the Citadel updates and balances the gameplay of the original release and adds new campaigns based on major events from the Mutant Chronicles universe and new creatures, such as the Praetorian Stalkers.