Ordo Hereticus
The Ordo Hereticus concerns itself primarily with threats arising from within the Imperium: corruption, forbidden cults, rogue psykers, treason and ideological contamination.
Ordo Xenos
Specialists of the Ordo Xenos investigate alien civilizations, artifacts and incursions. Their work ranges from battlefield intelligence to the study of technologies whose mere possession can be considered dangerously unorthodox.
Ordo Malleus
The Ordo Malleus is concerned with daemonic manifestations and the influence of Chaos. Its investigations frequently involve phenomena that ordinary Imperial institutions are neither equipped nor permitted to confront.
The Immaterium
The Warp is both the medium that makes interstellar travel possible and a realm shaped by psychic forces. Exposure to its entities and influence represents one of the most persistent existential threats faced by humanity.
Alien Civilizations
The Imperium encounters numerous non-human powers whose intentions, capabilities and methods differ radically. Some pursue conquest, others survival, and some represent threats that cannot easily be understood in conventional strategic terms.
The Astronomican
Imperial navigation depends upon the Astronomican, a psychic beacon projected across much of the galaxy. Its continued operation is a strategic necessity for communication, logistics and military movement on an interstellar scale.