Swarm Spawners are Mob Spawners added to world gen by Deadly World. These have a 10% chance of replacing the normal mob spawners, by default. The mobs it spawns are normal, but instead of creating 1-4 mobs, it generates 8 mobs. Swarm Spawners have half the detection radius of a normal spawner, but a larger spawn area. Swarm Spawners will always have a chest containing high tier loot beneath them. The spawn rate, as well as the power of the mobs it spawns, can be changed in the config file.
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