The Hydra: The Hydra is a thing not of the real world, but not entirely of the Chaotic Immaterium. It was brought in to being on a world in the Eye of Terror, but was used by an inner circle of Inqusitors, called the Order of the Hydra, in a plan to control all of humanity.
All parts of the Hydra are joined to the same central being that inhabits a hulk drifting in the Warp. The known infestations were below Kefalov and Vasilarov.
Source: Draco by Ian Watson
Submitter: IBBoard
Hive World Terra