Eisenhorn is a trilogy of novels by Dan Abnett set in the Warhammer 40000 universe, following the adventures of Inquisitor Eisenhorn and his retinue as they combat the enemies of the Imperium of Man. Throughout the books, Eisenhorn finds himself having to use increasingly desperate and dangerous means against his foes.The first book, Xenos, starts with Gregor Eisenhorn and his crew pursuing a heretic in a seemingly routine task when they uncover a mysterious artifact bearing the preserved mind of the heretic Pontius Glaw. In the subsequent investigation, Eisenhorn and crew find themselves embroiled in a heretic group's plan to contact aliens for a demonic text.The second book, Malleus, begins with a major celebratory parade ruined by Chaos-linked renegades. The pursuit of these enemies leads to Eisenhorn uncovering and defeating a much-revered Inquisitor gone to Chaos.The third book, Hereticus, sees Eisenhorn pursued by allies of Glaw and his attempt to stop Glaw from acquiring a world-ending power.There are also two short stories available, both of which can be found in the doorstoppingomnibus edition. A spin-off trilogy, Ravenor, has been published and Dan Abnett has begun a third "Bequin trilogy", described by him as "Ravenor Vs Eisenhorn".In the mean time, Eisenhorn is set to appear in a set of Audio Dramas, collectively called Talon and Thorn.
As part of Warhammer 40000, the series involves a large number of the tropes on that page, as well as employing literary and narrative tropes of its own:
Alien Geometries: The saruthi "tetrascapes" in Xenos, and in a different way, the world of Ghul in Hereticus.
And I Must Scream: Ravenor, as a result of the Thracian Gate massacre in Malleus. He's basically the main character in Johnny Got His Gun, except that his psyker ability allows him to function through his force chair.
Anticlimax Boss: A relatively minor villain in Xenos is shown to be an ungodly powerful psyker. Not only could he force the submission of a Chaos Space Marine, he was able to tear a cipher for the Necroteuch from the walls of the saruthi tetrascape. He forced a wall to divulge its secrets with the power of his mind. It left him largely burned out, though, too weak to stop Heldane from just shooting him.
At the end of Hereticus, a Daemonhost that belongs to Glaw was thought to be stronger than Cherubael by dint of being less stringently bound. Cherubael was apparently strong enough that he wiped the floor with it anyway, though we don't get to see it. He does make a note about being nastier than Eisenhorn ever imagined.
Anyone Can Die: By the end of Hereticus, much of the main cast are either dead or severely incapacitated.
Armour Is Useless: Unusually for this setting; it saves someone's life only once in the trilogy.
Badass: Several. Harlon Nayl, both Betancores, Eisenhorn himself has moments (to the point where a Space Marine is scared of him), Cherubael, Commodus Voke, Brother Guilar takes a level, and Librarian Bryntoth (implied).
For non-40k familiar tropers, a "Librarian" in 40k is a genetically engineered super-soldier with the power to tap into a primal chaotic force in battle. "Librarian" is their day job.
Badass Grandpa: Technically, Cherubael qualifies, as he is thousands of years old. A more literal example is Commodus Voke - Eisenhorn describes his psychic powers as "legendary". He even stands up to a daemonhost and saves Eisenhorn's life.
The best example is Lord Inquisitor Phlebas Alessandro Rorken - he banishes an Eldritch Abomination by charging it with a holy flamethrower and yelling prayers.
Badass Cape: Pontius Glaw, in the final encounter with him, wears one made of many small, very sharp blades.
Badass Longcoat: Eisenhorn is fond of billowing overcoats, although, cover picture be damned, he's never actually mentioned as wearing two at once.
Beauty Is Never Tarnished: Alisebeth Bequin, who manages to be glamorous and alluring even while exchanging gunfire with enemy heretics.
Bittersweet Ending: Pontius Glaw's apocalyptic plan is foiled...but most of Eisenhorn's companions have been killed in the process, and he is considered a rogue and a heretic.
Considered nothing. He IS a rogue and a heretic. Albeit, a very well-intentioned one
Brown Note: The utter, incomprehensible scale of the daemon-king's tomb on Ghul in Hereticus drives a hired gun to tears.
In Malleusbeing an ordinary human attending the parade...
In Herectus, the Chaos Titan has dirge casters that blast infrasound onto the battlefield. For reference, infrasound is a noise that inspires unfounded fear, dread, and paranoia in those that hear it.
Then again, his lower torso is robotic, so it's unlikely he has physical needs to attend to. When he has human passengers, Eisenhorn observes that he's delighted simply to have someone to show his art collections and talk to.
Captured Super Entity: The Psykers whose kidnappers were responsible for the Thracian Gate atrocity in Malleus. Also, the daemonhosts Cherubael and Prophaniti, to an extent.
Compelling Voice: Eisenhorn and other Inquisitors, through what Eisenhorn refers to as "the will", a manifestation of their psyker abilities. Agents of Chaos display this power as well.
Continuity Drift: At one point Eisenhorn mentions the "Primarch" of the White Consols, by which he clearly means the "Chapter Master", but the distinction was less well established in canon back when Malleus was written, or possibly Eisenhorn just didn't know better in character.
Continuity Nod: Inquisitors Heldane and Ravenor both appear in Abnett's earlier Gaunt's Ghosts novels. Titan Princeps Hekate (from the Graphic Novel series Titan) is also mentioned in Malleus, albeit as an old man near retirement, which was a pleasant surprise for fans, as his own series by that point seemed to have ended in a Heroic Sacrifice.
One of Battlefleet Scarus' ships is named Defence of Stalinvast, after the planet subjected to Exterminatus in Ian Watson's Inquisition War Trilogy.
A slightly knotty one in Malleus. Eisenhorn mentions his plans to meet with a group of other inquisitors, one of which includes Defay, from the Inquisitor comic series in Warhammer Monthly. Confusingly, Defay as also mentioned in Gaunt's Ghosts, which is set many hundreds of years after Eisenhorn.
Not necessarily an error - in the Warhammer 40,000 universe medical technologies, cybernetics, a better diet, and drugs can keep the well-heeled alive for centuries.
Could also merely be another inquisitor by that name. It is, after all, a vast organisation.
Crapsack World: For the most part averted. Although Eisenhorn visits many deeply unpleasant places during his adventures, this must be taken in context with the larger Warhammer 40K universe. Yes, there is still galaxy spanning war going on, but Imperial society is shown as functioning and, in the case of the planet Gudrun, can be extremely pleasant or at least tolerable.
Taken straight with Hive Worlds like Thracian Primaris and Sameter.
Eldritch Location: Saruthi tetrascapes. In the coastal regions of a tetrascape, waves break backwards, and that is the least weird thing about them.
It's implied that the Saruthi intended them to be unnerving, as they were created for the aliens to meet and bargain with other races—the Saruthi wanted to intimidate visitors to establish that they were in control.
Friendly Enemy: Cherubael to Eisenhorn, at least at first, because Eisenhorn can free him from his servitude to Quixos. He becomes much less friendly (and somewhat less of an enemy) later on, after Eisenhorn re-binds him and sticks him in storage, occasionally pulling him out to battle powerful opponents.
Frozen Face: Eisenhorn is left unable to make any kind of facial expression after the extensive neurological damage he suffers during Locke's Cold-Blooded Torture.
Guns Akimbo: Midas and Medea Betancore fight with a pair of needle pistols, and Interrogator Inshabel is armed with a pair of laspistols.
He Who Fights Monsters: Eisenhorn falls into this rather badly, starting out as a "conservative" inquisitor unwilling to accept that using Chaos against itself is a viable strategy. A combination of compromise and desperation, however, eventually leads him to summon a Daemonhost of his own. Ravenor is of the opinion that Radicalism is inevitable for Inquisitors, and the only hope for them is to do as much good as they can and hope they die before Jumping Off the Slippery Slope.
Harlon Nayl puts an interesting spin on the concept. He tells Eisenhorn that sometimes you've got to bend and break the rules in order to win. Eisenhorn assumes that this is equivalent to "the end justifies the means". Nayl denies this, noting that confusing the two is what leads to the slippery slope.
Fridge Logic kicks in when you realize that both of them are trying to self-justify. The series gives us several Inquisitors of long service who don't turn radical, such as Rorken, Voke, Bezier, Neve and Ricci.
Lawful Stupid: You'd be astonished how easily Inquisitors get caught by this.
And Christ, does the witchhunter in Malleus fall under here. His first appearance is him trying to execute Eisenhorn for heresy (though saving his life in the process) on absurdly stupid charges. Eisenhorn shortly thereafter recounts a mission where twenty-odd newly discovered psykers, all under 14 years old, were abducted by raiders before the Black Ships could pick them up. Seeing that psykers are extremely rare, and even rarer to find at such young ages, Eisenhorn launches a mission to rescue them...while the witchhunter decides that kidnapping classifies them all as witches that are in dire need of execution.
Not only are psykers very uncommon but the reason that the Imperium sends Black Ships to collect them in the first place is because they're literally necessary for space ships and the Emperor to continue to function. They're distinctly worth rescuing for all sorts of warm and cold hearted reasons.
Considering how dangerous a psyker can be, executing a potential rather than potentially brining a trojan tyke bomb into a secure location may be the smarter move. And while said witchhunter was (arguably) mistaken at the time, it is hard to deny that Eisenhorn became exactly what he feared by the end of the series.
Mercy Kill: Invoked as Eisenhorn explains why he could not do it to the dying victims at the opening of Xenos.
Minor Crime Reveals Major Plot: Done as only 40K can do it. The first chapter has Eisenhorn hunting a traitor with thousands of murders on his record, not to mention innumerably more acts of smuggling, sabotage, and theft, who is nevertheless only a tiny cog in the grand scheme. It gets much bigger from there.
No Good Deed Goes Unpunished: Eisenhorn arranges for Pontius Glaw to be given a mechanical body in return for his guidance on how to create a daemonhost. This turns out to be a very, very, VERY bad move.
A milder example in the audio dramas. Master Immus, a clerk who has been used as a pawn in a heretical scheme, goes to a young Eisenhorn and confesses. After a long night of interrogation and mild mind rape, Eisenhorn comes to the conclusion that Master Immus is completely innocent of any involvement in the scheme and is grateful that a man did his Imperial duty by coming forward. The sentiment is decidedly one sided though because it results in the man's place of work being permanently shut down, every employee without a reference or any means of social support.
Obviously Evil: Discussed in-story with regards to the Necroteuch and Malus Codicum. The Necroteuch is obviously dangerous from the get-go, overtly attempting to take control of its user's mind and force their submission to Chaos. The Malus Codicum, on the other hand, is just a small black book. A nondescript, unremarkable book that one might find anywhere. Naturally the latter is much more dangerous.
Once More With Clarity - In Hereticus, Eisenhorn and Ravenor hold an auto-seance to see what Pontius Glaw was up to on a planet. They watch a scene with him and an orgyn and a man with an auphex, but they can't tell what they are doing. Eisenhorn tells the astropaths to expand the area of the seance and they see that Pontius was performing an auto-seance as well. The Farseer then helps reveal what Pontius saw which made the scene make more sense.
The Pirates Who Don't Do Anything: While he can hardly be accused of "not doing anything," Eisenhorn is The Ordo Xenos Inquisitor Who Doesn't Deal With Aliens Very Often. Mostly because he keeps getting distracted by heretics, daemonhosts, other Inquisitors, and his own past decisions come back to bite him in the ass. Is there a variant for "The Pirates Who Don't Do Anything Related to Piracy"?
Though his allegiance to the Ordo Xenos might explain why he was so sensitive to Ravenor's remarks about the virtues of the eldar.
Ragtag Bunch of Misfits: Eisenhorn's retinue. Included in their number: a gunslinging pilot, an aging scholar who's literally addicted to knowledge, an ex-cop, an anti-psychic prostitute, and a flamboyant cyborg starship captain. And that's just the first novel.
Right Hand Versus Left Hand: Eisenhorn regularly finds himself pitted against other Inquisitors with ideological stances either more conservative or liberal than his own. He states outright that his possession of the Malus Codicum would prompt half the Inquisition to try and kill him for having it and the other half would do the same in the hopes that they could get their hands on it.
Scars Are Forever: The torture in Xenos produced permanent and noticeable nerve damage. Suffice to say, Gregor cannot smile anymore.
Also an example of Cursed with Awesome - it comes in handy when Eisenhorn is trying to conceal his emotions.
Shout Out: Eisenhorn lost his virginity to a maid in his boarding school, at the age of sixteen. Like a certain other notable intelligence agent...
Spinoff: Interrogator Ravenor, a supporting character in the Eisenhorn books who was pretty much developed from a namedrop in the Gaunt's Ghosts series, later became the protagonist of his own novel series. Eisenhorn itself is a spinoff of the InquisitorGaiden Game to Warhammer 40000, and the first novel was released concurrently with the game itself.
Villainous Breakdown: Pontius Glaw has a fatal one when Eisenhorn burns the Malus Codicium. Cherubael has an understated one when Gregor binds him again in the second book.
Well-Intentioned Extremist: A vital theme throughout the series, and a central part of the last two books. As an Inquisitor, Eisenhorn is this by definition. He starts out with more emphasis on the "Well Intentioned" side and ends up with more on the "Extremist."
And then an even further confusion is heaped on that judgment when you understand that the people declaring him to be a heretic are overwhelmingly Knight Templars, with periodic sprinkling of Lawful Stupid.