Add the following to the list of characters that can be in a data store

! - a Firewall. When performing the maximum sum of the Suspicions calculation for a Location during the sweep, the total for each location is reduced by one for each Firewall at that location.

add the following to the end of the rule data

At any time, an AI may perform a Conspicuous Action named Installing Firewalls, which replaces a File from a Data Store of the Location they are focusing on with a Firewall

At any time, an AI (the Ejector) may remove a Firewall from their server room in order to perform a Discrete Action named Ejecting Trespassers. To perform this action, they must then select an AI (the Ejectee) whose Focus is the Ejector’s Server Room. If the Ejectee does not have a server room, or their server room has the Off-Grid or Airgapped tags nothing happens. Otherwise the Ejectee’s Focus is set to their own Server Room.