Filter Upgrade (Progressive Automation)

Filter Upgrades are a set of four items in Progressive Automation. They are consumed to configure the Killer to only target specific types of entities.

Usage
By default, a Killer will attack all entities that come into its range. Once one or more Filter Upgrades are installed, the Killer will ignore all entities that it does not have filters for. Multiple Filter Upgrades can be installed in a single Killer. When a Killer is picked up with a PA Wrench, consumed Filter Upgrades are retained in it. When a machine is broken otherwise, all installed Filter Upgrades drop as items.