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Footholds spawn invasions, where the monsters from the rift venture into the world to create more footholds "from which more invasions can spawn". The invaders may attack other rifts or mount an attack on a target such as a town; if a town is taken over by an invasion, the NPCs of that town will not be present until players take the town back. Invasions from different plane types will also attack each other if they meet, and rifts of the same type will assist each other if they are in the same area.