Silverfish Nests are a structure added by Deadly World that are made up of Silverfish blocks. There is a spawner in the center of the nest that spawns silverfish at twice the rate of a normal Mob Spawner. There is a 20% chance that the silverfish spawned will be aggravated, meaning that they will continuously call for other silverfish regardless if damaged or not. There will always be a chest beneath the spawner, containing average dungeon loot. They can spawn anywhere beneath layer 62, but this, along with the detection range, aggravation rate, and spawn speed can be changed in the config file.
