Know what happens when you don't pay the Stone Rats their dues? You get your legs broken! The Stone Rats run this swamp!
— Stone Rat
Stone Rat Assault is an Event that can trigger if the Player has defeated either the Stone Rat Visit or Stone Rat Assault events. It cannot trigger if the player is allied to the Hounds faction, or if Big Al has been killed or captured.
Once the conditions have been fulfilled, the Stone Rats will send an assault to the player's Base. This assault has two variants, depending on the source of the event.
- The first variant can trigger if the player has defeated the Stone Rat Visit event, or sometimes as a response to defeating the first variant of the Stone Rat Assault event. This assault is made up of 2-3 squads, each made up of 5-6 Stone Rats. If the assault is defeated, there is a 30% chance to trigger another of the first variant again in 48-80 hours, and a 55% chance to trigger the second variant in 48-80 hours.
- The second variant can only trigger as a result of defeating either of the variants of the Stone Rat Assault event. It consists of 4-5 squads, each made up of 5-6 Stone Rats. If the assault is defeated, there is a 30% chance to trigger the second variant again in 60-100 hours.
If either variant is victorious, they are supposed to ransack the base for food, breaking into buildings and stealing whatever they come across. This ransacking behavior is bugged in vanilla though, and will usually result in NPCs getting caught in a loop running around the base and standing in doorways. Stone Rat Visit will also trigger in 90-110 hours.