Installing this module provides the benefit of having Pain Fields in the Respawn room and Generator room that deal 5 damage per second to any enemy inside it. While there is always a Pain Field in the Respawn room when the generator is online, the pain module increases its lethality. Cavern spawn rooms deal Pain Module damage by default.
The pain module is useful for base defense and to protect other modules installed at the base. When combined with the boosted pain fields from expert hackers (increasing the damage done to 15 damage per second), it is very difficult to destroy the generator, and thus difficult for the enemy to steal modules. Similarly, when combined with a boosted pain field, the Spawn Tubes are difficult to destroy as well, normally forcing the enemy to place a hack on the base before the tubes can be destroyed.
This module appears as beige on the Continental Map.