[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/titanicus.png]]
''Titanicus'' is a standalone novel by Creator/DanAbnett, set in the ''TabletopGame/Warhammer40000'' universe. When the vital forge world of Orestes comes under attack by a legion of Chaos Titans, the planet is forced to appeal for help. Titan Legio Invicta, although fresh from combat and in desperate need of refit and repair, responds, committing its own force of war engines to the battle. As the god-machines stride to war, the world trembles, for the devastation they unleash could destroy the very world they have pledged to save.

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!!As part of ''TabletopGame/Warhammer40000'', the novel involves a large number of the tropes on that page, as well as employing literary and narrative tropes of its own:
* ActionPrologue: The book opens following a doomed PDF regiment trying to survive against a Chaos Titan.
* AmbiguousEnding: While most of the story threads are tied up, the fates of many characters are deliberately left ambiguous. To wit:
** [[spoiler:Whether Varco and Kell initially appear to die when the Chaos tower collapses, with them simply being described as knocked flat and the second last paragraph of the book implying they at the very least made it back to the halt. Their fate after that is unknown.]]
** [[spoiler:Max Orfuls and ''Morbius Sire'' are last seen in the pitched Titan battle cornered by three archenemy Warhounds, with Imperial Warlord ''Tantamount Stridex'' moving to assist. Whether ''Stridex'' arrived in time is unknown.]]
** [[spoiler:Lau is reported killed in the ground fighting of the same battle, though it is specified that these reports are unconfirmed, and they remain such for the rest of the novel.]]
** [[spoiler:Tarses, Prinzhorn, and ''Dominatus Victrix'' are last seen doing well in the fight, but taking damage and facing down an archenemy Warlord. Though the crew are confident, whether they won this duel or survived the battle is unknown.]]
** [[spoiler:The toymaker is last seen hiding in his store after nearly getting caught up and killed in an anti-Mechanicus riot. Kids are shown playing with his toys after the war is over, but nothing is said over whether they had been freshly bought or if they were purchased earlier, so whether or not he survived the riots is unknown.]]
** [[spoiler:The SoleSurvivor of the coup's organisers is last seen emerging from the forge gates and kneeling before Gearheart's engine, after which the scene cuts away]].
* AnyoneCanDie: It's a Dan Abnett novel. By the end of the story [[spoiler:Imanual, Tolemy, Egan, [[RedShirtArmy most of Activated Twenty-Six]], Stefan Samstag, Lux-88, Tephlar, Karsh, and all but one of ''Nicomach Ignix'''s crew]] are all dead, and most of the remainder are last seen in [[UncertainDoom dangerous situations with their ultimate fates unconfirmed]].
* ArtificialLimbs: The members of the Adeptus Mechanicus are augmented to varying degrees.
* BarBrawl: A drunken Stefan kills a man from [[Literature/GauntsGhosts Tanith]] after he indirectly badmouths Cally.
* BittersweetEnding: [[spoiler:The Chaos invasion is thwarted, the schism-slash-CivilWar is narrowly averted, and Orestes survives to see another day. However the majority of the cast are either dead or [[UncertainDoom last seen in potentially fatal situations]], Cally has lost her husband as the end of a TraumaCongaLine, and the deeper issue of the doctrinal schism is still unresolved.]].
* BrownNote:
** The "shockroaches" (Chaos combat servitors) cause Cally to projectile vomit when she gets a close look at the Chaos markings on their armour.
** The Chaos scrapcode is painful to the augmented members of the Mechanicus, and is implied to have other negative effects.
* BoisterousBruiser: The skitarii, the military arm of the Mechanicus, are described as being boastful, loud, and flamboyantly dressed (the Invicta skitarii favor feather-crested helms), in contrast to the dour, disciplined, and subdued Imperial Guard stationed on Orestes.
* BookBurning: [[spoiler:Imanual]] burns any sequestered book that comes his way that might threaten the Imperium. It's how the conspirators suss out that he'll never side with them, as ''they'' are the ones leaking the books to gauge who's sympathetic to their cause.
* CivilWar: The revelation about the God-Emperor and the Omnissiah threatens to split the Mechanicus from the Imperium, as well as fracture the Mechanicus itself between fractured loyalties. [[spoiler:Civil war is put on hold as a secondary force of Chaos Titans are discovered on the far side of the planet and closing on the Mechanicus's forges, and only narrowly averted by the novel's end]].
* CoversAlwaysLie: There are no Space Marines in this book - it's reused artwork from an earlier gaming supplement, which predominantly featured Titans alongside other units including Space Marines.
* CurbStompBattle: The Orestes Pride Armor corps is wiped out by the Chaos Titans, due to the latter's superior maneuverability and firepower.
* CyberneticsEatYourSoul: Princeps Maximus Pietor Gearheart is worried about losing his personality to the machine spirit in his Titan, ''Invictus Antagonistes''. He strives to know his crew personally and even makes it a point to try to engage them in small talk, so he can hold on to his humanity. It's not working very well, since he keeps mistaking his current crewmembers for deceased ones who originally held their stations.
* DangerousForbiddenTechnique: Linking the control of multiple Titans to one princeps is forbidden, as interacting with multiple powerful machine spirits at the same time runs the high risk of driving the princeps insane and exposing them all to [[BrownNote Chaos scrapcode]]. [[spoiler:When the Dark Mechanicus unleashes its Imperator-class Titan in the penultimate battle, Princeps Kung orders all of the Invicta Titans to link their control to his own Titan. They do so under protest but it allows Kung to target all of their weapons at one spot on the enemy Imperator, which causes its shields to completely short out, allowing the Imperium forces to tear it to pieces. Fortunately, Kung is able to do this quickly enough to avoid destroying his sanity.]]
* DeadPersonConversation: As the stress of piloting his Titan takes its toll, Gearheart starts having these with long-dead Principes he served under.
* DoomedByCanon: The conspirators of Orestes plan on divorcing Mars and Terra (ignoring their enemies' plea that it would be disastrous for both). Considering what we know about the future of ''TabletopGame/Warhammer40000'', they obviously can't succeed.
* DoNotGoGentle: Karsh, Tephlar, and Lux-88. While all three are eventually taken down [[spoiler:after the schism goes hot,]] they take down dozens of enemies with them and have to be ''literally'' shot to pieces before they stop fighting.
* DrivenToSuicide: [[spoiler:Egan]] shoots himself in the head after [[spoiler:realising that the entire schism, Imanual's murder, and his killing of Tolemy [[AllForNothing were for nothing]], due to Tolemy's manipulations rendering the supposedly ironclad data impeachable]].
* EnemyMine: [[spoiler:The discovery of the second Chaos Titan Legion forces the Legio Invicta and Legio Tempestus to set aside the theological dispute that was splintering the Mechanicus on Orestes to defeat them. Fighting side by side in the biggest Titan battle in millennia also unites them into a single force that was willing to take down Tolemy once the battle was over.]]
* EnsignNewbie: Guido Prinzhorn, a princeps from Legio Tempestus, is assigned to take the place of the princeps of the Legio Invicta Titan ''Dominatus Victrix'', whose entire crew save Moderati Zane Tarses was killed when Invicta was battling the Eldar in their last mission. Unfortunately, Prinzhorn has never seen actual combat. [[spoiler: After some difficulty getting along with Tarses, it turns out he manages to acquit himself well enough when the shit hits the fan.]]
* GuiltRiddenAccomplice: [[spoiler: Egan, Feist's boss]], ascribes to the belief in an Omnissiah separate and distinct from the Emperor, but he [[NotWhatISignedOnFor does not want to be party to murder]] and is distraught when [[spoiler:Tolemy kills Imanual]], and when [[spoiler:Feist]] is slated to be killed as well. When [[spoiler:Tolemy accidentally implies that he manipulated the data]] that caused the schism, he kills [[spoiler:Tolemy]] to prevent him from killing [[spoiler:Enhort (who was willing to call off the whole plot and reconcile with Invicta and the Imperium, since the reason for the schism was now in doubt)]], but then turns his bolt pistol on himself.
* GunsAreWorthless:
** Horrifyingly played straight in the opening where the PDF team are unable to even scratch the Chaos Titan stalking them with the weapons they're equipped with. They use every last round they have, and the PDF commander literally throws his damaged radar at the Titan since he has nothing left. Lampshaded when Valkryie Gunships are sent to help and the PDF commander says they won't be able to do a thing against the giant robot-monster stalking them.
** Also played straight with Varco's Vanquisher tanks, even though they have specially designed anti-armour cannons, they're designed to eliminate other tanks, not Titans; the most they do to an enemy Titan is force it to take a single step back. The Titan they were sent to distract leisurely kills them all.
* HeKnowsTooMuch: Feist, Kalien, and [[spoiler: Imanual]]. Only the latter gets offed, however.
* HeroicSacrifice: [[spoiler: Varco's entire crew of survivors perishes in order to bring down the Chaos tower]]. Meanwhile, [[spoiler: Imanual sacrifices his own life in order to help Feist and Kalien escape the conspirators]].
* HumongousMecha: It's Imperial Titans versus Chaos Titans on a scale rarely seen since the Literature/HorusHeresy.
* IKnowYourTrueName: Invoked in an non-standard way. Most of the Chaos Titans in the enemy army were Imperial Titans before the Horus Heresy. Knowing this, a Mechanicus research team begins working out what they were originally commissioned as, and cross-referencing against other records on those Titans from the pre-Heresy days, acquire information about their performance and inherent weaknesses that the Imperial Titan legions can use against them.
* {{Irony}}: Cally and Stefan are both afraid the former won't make it home from the war. [[spoiler:Cally survives on the battlefield against all odds. Stefan gets himself gunned down by a hometown policeman.]]
* TheJuggernaut: [[spoiler:The Chaos Imperator Titan, ''Augmenautus Rex''. It makes its entrance by casually one-shotting a Warlord Titan, then rampaging around the battlefield to take down several other Titans. It's so tough that the Imperials had to resort to a DangerousForbiddenTechnique simply to make it vulnerable to damage, and even then it takes another ten minutes and two more Imperial engines' loss to bring the ''Rex'' down]].
* JustBetweenYouAndMe: Feist earnestly requests that the conspirators explain their plan to him before they kill him, and then they do so. [[spoiler:Feist records the entire conversation.]]
* LittleHeroBigWar: The narrative is spread out among the various plot threads, the Titanicus princeps actually fighting the war, and the Imperial-Mechanicus and inter-Mechanicus politics take center stage, but the other plotlines follow around little folks.
** Stefan and Cally, a longshoreman who emigrated to Orestes, and his wife who got to join him by conditionally joining the PDF. As the war starts up, Cally is called out for support and possibly to fight, while Stefan tries to continue to work in wartime conditions and come to terms with the idea that his wife might not come home.
** Varcos is an armoured battalion commander who narrowly survives a brush with an enemy Titan. Now in the wilderness with his small band of survivors with no tanks, no support, and no means of communicating with the Mechanicus, Varcos has to find a way back or do his part in the war.
* MadnessMantra:
** "The magos organos's name was Kercher."
** Chaos Titans are depicted as constantly screaming their names in corrupted code language.
* MachineWorship: While all the members of the Adeptus Mechanicus engage in this practice, ''Titanicus'' sees the debate on the theological relationship between God-Emperor and the Omnissiah reach a breaking point. The members on Orestes generally see the Omnissiah as a separate being, while the members of Legio Invicta see them both as the same. Also, at several points, a few people on both sides of the ideological divide roundaboutly argue -- to avoid open heresy -- that it doesn't matter if the God-Emperor isn't the Omnissiah; Mars and Terra can't endure independent of one another, and attempting to divorce them will just invite extinction for both.
* ManipulativeBastard: [[spoiler: Tolemy, master of the archives, is the one that comes up with the plot to initiate the schism between the Mechanicus and the Imperium. Turns out he's doing this purely for personal gain, as the plan would result in him becoming Adept Seniorus of the Forge, a position he felt was unfairly denied him.]]
* MaybeMagicMaybeMundane: Varco has an Omnissiah medallion that was originally attached to the armor of his tank, ''Queen Bitch'', and after ''Queen Bitch'' is destroyed by a Chaos Titan, the medallion mysteriously appears in his pocket, and for the rest of the story it seems to give him some incredibly good luck.
* TheMerch: InvokedTrope. One subplot is a toymaker who thinks to repair his declining fortunes by selling model Titans. It works, then he starts making more money by painting them in the colors of the two Legios defending Orestes, then even more by painting them in the heraldry of specific Titans that were featured in Imperial propaganda for distinguishing themselves in battle. [[spoiler:Then the Mechanicus schism breaks out, causing his former customers to mistake him for a Mechanicus sympathizer by Imperial citizens, and he nearly gets killed by a rioter.]] What happens to the toymaker after that is never specified.
* MyGodWhatHaveIDone: Enhort and Egan when [[spoiler: they realise they were used by Tolemy so he could make a power grab, Egan feels so guilty he shoots himself.]]
* NiceJobFixingItVillain: The surprise attack conducted by the second armada of Chaos engines helps to avert a civil war that could possibly have destroyed the Imperium and driven humanity to extinction. To be fair, they weren't exactly in a position to know an EnemyCivilWar was about to break out.
* PardonMyKlingon: The novel includes a number of curse words used by the Adeptus Mechanicus. For a group so dedicated to logic, they can still get incandescently error shunt abort (pissed off) enough to call someone a scrapshunt (heavily implied to be an insult on the level of "motherfucker").
* RedShirt: Pretty much everyone in the PDF, examples include the PDF in the opening, the PDF in Varco's armour column who who don't survive and most of Cally's Tertiary PDF.
* RedshirtArmy: Most of the PDF troopers exist to die horribly at the hands of the Chaos forces, with Cally's unit losing most of their number in the first engagement due to how hopelessly outmatched they are.
* ReasonableAuthorityFigure:
** Princeps Maximus Gearheart is this [[spoiler:when the threat of Civil war starts by trying to maintain the status quo, supporting the Imperial Governor and refusing to fire the first shot at Legio Tempestuous.]]
** Adept Senorius Imanual is another example. A throw-away comment shows that he has the exact same theological stance as the rest of the forge, and even shows contempt for the idea that the Emperor and the Omnissiah are one. However, he is also smart enough to know that a schism would destroy both the Imperium and the Mechanicum, so even when presented with "proof" of his views, he refuses to use it, and instead destroys it.
* SanitySlippage:
** Princeps Gearheart is slowly losing his marbles as a side-effect of his princepture and interment in an amniotic tank. Gearheart himself is fully aware and terrified of this, and his CharacterArc centres around him desperately trying to combat this gradual slide by maintaining a human relationship with his crew.
** ''Nicomach Ignix'''s SoleSurvivor is driven insane by the trauma of violent Manifold disconnection, courtesy of a ballistic ImpromptuTracheotomy (i.e.: having the connection plugs shot out of his neck) by Chaos Skitarii.
* ShowDontTell:
** {{Inverted}} in TheReveal ''how'' the God-Emperor and the Omnissiah are proven to be different entities. The reader [[TakeOurWordForIt is not told what it is or how it's framed]], only the characters' reaction and that the evidence is pretty much bulletproof.
** We get an explanation in the ''Literature/HorusHeresy'' novel ''Mechanicum''. Turns out [[spoiler:the Omnissiah is actually a C'Tan]].
* SociopathicSoldier:
** The Skitarii are described as this ''by design'', they're augmentically enhanced to be deadly killing machines, brainwashed into being psychopathic and as soon as the fighting starts, they're pumped full of drugs to send them into a murderous fury. They also deliberately invoke this with battle dress that's made to look more like barbaric armour for the intimidation factor. Lampshaded by some of the characters' reaction to the head Skitarii.
** Made ''even worse'' with the Chaos Skitarii. When Cally meets one, she immediately thinks she's looking at an enemy Skitarii. In fact, [[spoiler:he's actually a ''regular loyalist'' skitarii, but his looks were so fucked up, that Cally immediately thought that he was a traitor]].
* SoleSurvivor:
** Moderati Zane Tarses is the only survivor of ''Stridex'''s original crew, with the majority of them dying to a group of Eldar titans and the wounded Princeps Skaugen subsequently dying in transit.
** ''Nicomach Ignix'''s crew is slaughtered by Chaos Skitarii, with only a critically injured moderati surviving ([[DrivenToMadness though his sanity certainly didn't]].)
** The unnamed Tempestus Princeps who Activated Twenty-Six rescue is the only survivor of his crew.
** [[spoiler:Enhort]] is the last survivor of the coup's organisers, after [[spoiler:Tolemy's killed by Egan and Egan [[DrivenToSuicide kills himself]]]].
* StatusQuoIsGod: See the DoomedByCanon entry above. Savvy readers will know that there's absolutely no way that the Mechanicus schism will come to anything and that the conspirators are doomed to failure because Creator/GamesWorkshop refuses to move the overall metaplot forwards in any way, shape or form.
* SuicideMission: [[spoiler:Varco's groups assault on the Chaos Shield tower is one of these although it's implied Varco and Kell managed to survive.]]
* SympatheticMurderer:
** Moderati Tarses flew into an UnstoppableRage and murdered a Magos who [[BearerOfBadNews delivered him the news that his wounded Princeps died during transit]] and accidentally implied he ''let'' himself die. Tarses himself deeply regrets this; his EstablishingCharacterMoment has him repeating his MadnessMantra ("[[TheDeadHaveNames The magos organos's name was Kercher.]]") to himself and admitting to Lau that he deserves execution for his crime. This guilt also forms a key part of his relation with Princeps Prinzhorn and his CharacterArc through the novel.
** Stefan Samstag kills a Tanith native after he insults the PDF. He's both drunk and highly emotionally unstable at the time, as his wife is currently fighting with the PDF and currenly incommunicado. He suffers a pretty severe [[MyGodWhatHaveIDone guilt-driven breakdown]] afterwards and spends the rest of the novel despairing over his crime.
* TitleDrop: The wheelbarrow Cally's PDF group put the [[spoiler:recovered Tempestus Princeps]] in is jokingly named 'Titanicus'.
* UnstoppableRage: Tarses snaps and kills the magos organos who tells him his wounded princeps died during transit. He feels immense regret about it once he's cooled down, and only avoids summary execution because Legio Invicta needs him, the sole surviving member of his Engine's original crew, to ease in the newbie replacements.
* UnusualChapterNumbers: The chapters are numbered in binary (1, 10, 11... instead of 1, 2, 3...).
* UnwittingPawn:
** Kalien is this to the conspirators. Knowing full well that she's an "ambitious little scrapshunt" who'd seize on any way of making a name for herself, they placed her in the Analyticae to ensure she'd "discover" the data and release it without thinking, letting them [[spoiler:pull off their coup]] without issue.
** [[spoiler:Tolemy expects Enhort to be one for him]], but that lethally backfires.
* WhatHappenedToTheMouse: The fate of the toymaker after the [[spoiler:riots due to the revelation]] isn't given. There is a scene at the end with children playing with some of his model Titans, but they could easily have been toys that he had sold much earlier, rather than an indication that he's still making and selling them.
* WeHaveReserves: {{Inverted}} - while Orestes has vast manpower resources, it being a Forge World and all, and while the governor is more than happy to use them, the call-up of the Tertiary Reserves of the PDF (including Cally) makes it clear that the war is going really, really badly for them.
* WellIntentionedExtremist: [[spoiler: Enhort]] genuinely believes he's the doing the right thing by proving the Omnissiah and the God-Emperor are not one and the same, as opposed to [[spoiler: Tolemy]] who's just making a power grab.
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