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Ravenous Viruses do not spawn on their own, but are instead created by damaging a Reluctant Virus by about 25%. Once the Reluctant Virus gets sufficiently damaged, it will morph into a Ravenous Virus and become far more hostile. Both forms are only found during the mission The Psychology of a Claptrap.
The Ravenous Virus will attack the Vault Hunters with both melee attacks and ranged fire attacks. The goal during the mission is to lure the Ravenous Viruses close to a deletion field, which the Viruses like to feed on. The Vault Hunters will want to keep the Ravenous Viruses alive so that they can fulfil the mission objective.