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A '''η-class (eta class)''' or '''Hive World''' is a category of [[Imperial]] planet distinguished by vast, continent-spanning cities, often built high into the sky and deep beneath the earth. Their populations are enormous, and almost all food needs to be imported. A hive world rendered temporarily inaccessible through warp space will suffer a devastating famine within a very short space of time. It will become a vast catacomb of lunatics driven to excesses of anarchic, urban savagery by starvation and claustrophobia. Hive worlds are dangerous, being too large to monitor safely, and their citizens are typically unbalanced, if not utterly crazed. It has been known for the [[Adeptus Arbites]] to cull these planets in order to bring their populations down to manageable levels.²