FIRST APPEARANCEXenos (2001)

Gregor Eisenhorn

Gregor Eisenhorn is a former Imperial Inquisitor of the Inquisition in the Warhammer 40,000 setting. Originally a member of the Ordo Xenos, Eisenhorn was known as a capable and highly respected servant of the Imperium who pursued threats such as alien influence, daemonic activity, and heresy with relentless determination. During his long career he built a loyal retinue and became involved in numerous investigations and conflicts across the Imperium. However, his prolonged pursuit of the heretic and Chaos agent Pontius Glaw and other enemies gradually pushed him toward increasingly radical methods, including the use of proscribed knowledge and forbidden tools such as daemonhosts. These actions ultimately led to Eisenhorn being declared a renegade by elements of the Inquisition, despite his continued belief that he served the Imperium’s survival.

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1 History

1.1 Early career

1.2 The Necroteuch Affair

History

Early career

Uber Aemos, savant and Eisenhorn's most trusted advisor

Early in his career, Eisenhorn served as an interrogator under Inquisitor Hapshant, alongside Titus Endor, with whom he developed a strong and lasting friendship. After eventually attaining the rank of Inquisitor himself, Eisenhorn enjoyed several successful years establishing his reputation. During this period, he began assembling the core members of his retinue, including the savant Uber Aemos and the skilled pilot Midas Betancore.

His relentless pursuit of the Imperium’s enemies ultimately brought him into conflict with the notorious murderer and Chaos agent Murdin Eyclone, a confrontation that would set in motion the chain of events that defined the rest of Eisenhorn’s life and career.

The Necroteuch Affair

Eisenhorn’s pursuit of Eyclone eventually led him to Hubris, a planet plagued by long periods of sub-zero temperatures. During these extreme freezes, the population survives by entering cycles of cryogenic sleep. Eyclone’s plan was to sabotage the cryosleep system, condemning the entire population to die while they slept.

Eisenhorn later uncovered the true purpose behind this atrocity: Eyclone intended to use the mass death as part of a ritual to empower and resurrect one of the Imperium’s most infamous heretics, Pontius Glaw.

XenosBOOK

The Inquisition moves amongst mankind like an avenging shadow, striking down the enemies of humanity with uncompromising ruthlessness. When he finally corners an old foe, Inquisitor Gregor Eisenhorn is drawn into a sinister conspiracy. As events unfold and he gathers allies – and enemies – Eisenhorn faces a vast interstellar cabal and the dark power of daemons, all racing to recover an arcane text of abominable power: an ancient tome known as the Necroteuch.

MalleusBOOK

A century after his recovery of the alien Necroteuch, Gregor Eisenhorn is one of the Imperial Inquisition's most celebrated agents. But when a face from his past returns to haunt him, and he is implicated in a great tragedy that devastates the world of Thracian Primaris, Eisenhorn's universe crumbles around him. The daemon Cherubael is back, and seeks to bring the inquisitor to ruin - either by his death, or by turning him to the service of the Dark Gods.

HereticusBOOK

Across countless worlds, the Inquisition pursues a secret war against humankind’s foullest enemies – the alien, the unclean and the unholy. When a battle with an ancient foe turns deadly, Inquisitor Eisenhorn is forced to take terrible measures to save the lives of himself and his companions. But how much can any man deal with Chaos before turning into the very thing he is sworn to destroy?

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FACTIONOrdo Xenos