Popularity cost for parish: -10
Only one castle may appear in a parish at one time.
These castles periodically send out very big plunder waves of 400 peasants at a single player’s castle. They can easily be defeated.
The popularity cost to the parish when the rat is in it is very small but because the castles can be defeated so easily you might as well take them out as soon as they appear.
No Rat Castles contain ballista or Great Towers
Some Bandit Camps are actually stronger than Rat Castles