The Raiders of the Lost Vault are a sadistic group of raiders who come from Vault 75 that was nearly destroyed in the early moments of the war. The vault was accidentally pumped with radiation causing the fusion reactor to overload which filled the vault with a type of gamma radiation mixed with nuclear radiation. This caused all the residents to become a mutated version of ghouls. This mutated version of ghouls were immune to radiation but still kept a human-like appearance, but with blood red skin.