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-> Do not ask ''"Why Kill the Alien?"'', rather ask, ''"Why not?"''

''Deathwatch'' is the third in the ''TabletopGame/{{Warhammer 40000}}'' roleplaying game series. While ''DarkHeresy'' focuses on agents of the Inquisition, and ''RogueTrader'' focuses on [[ExactlyWhatItSaysOnTheTin rogue traders]] and their crew, ''Deathwatch'' casts the players as {{Space Marine}}s of the Ordo Xenos Deathwatch, a sort of special operations group tasked primarily with defending humanity from alien horrors. Even among the Space Marines, the Deathwatch are considered to be an elite unit -- and when the typical Space Marine is a seven-foot tall SuperSoldier with [[{{BFG}} a standard-issue fully-automatic grenade launcher]] and [[PoweredArmor armor that can stop a tank shell]], that's pretty impressive.

Now think about what you're going to be up against...

Six Chapters are included in the core rulebook, five of which already exist in the ''Warhammer 40,000'' canon: the Space Wolves, Ultramarines, Dark Angels, Black Templars, and Blood Angels. According to the [[WordOfGod blog]], these particular Chapters were chosen to create stark contrast in tactics and personalities within the party between members of different Chapters (though the fact that they're also 40k's flagship Chapters, each with its own codex, probably doesn't hurt). The sixth Chapter, the Storm Wardens, are an original creation of Fantasy Flight Games; the lessons the dev team learned in creating this Chapter are expounded upon in the ''Rites of Battle'' supplement, so you can have a go at creating Chapters of your own, [[SpecialSnowflakeSyndrome you special snowflake, you]].

See also ''DarkHeresy'', ''RogueTrader'', ''BlackCrusade'', ''OnlyWar'', and of course ''TabletopGame/{{Warhammer 40000}}''.

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!!This game provides examples of:

* AbnormalAmmo: Deathwatch Tactical Marines are issued boltguns with a dual-magazine system and a fire selector that allows them to switch which magazine the chamber is fed from. Typically, one magazine will use standard rounds, the other will have specialized rounds for combating specific kinds of threats. These are the same kinds of special rounds which are normally only issued to Sternguard Veterans in their home chapters, but no marine comes to the Deathwatch who is not already experienced and distinguished among his chapter peers.
* TheAce: ''Deathwatch'' really hammers home that this is the Ultramarines' [[PlanetOfHats hat]]. Not only do the Ultramarines get a bonus to interactions with other Imperial soldiers because of how well-respected they are, but their Chapter-specific Squad Mode abilities are both based on the Ultramarine's Fellowship -- meaning that a Kill-team that includes an Ultramarine will actually fight better ''because'' he has a Ph.D. in being handsome and wonderful. What a guy!
** This is taken so far that the Ultramarine's Primarch's Curse (caused by getting too many Insanity points) actually causes the Ultramarine in question to lower squad cohesion if he ISN'T put in charge.
* AscendedMeme: ''Mark of the Xenos'' gives stats for greater daemons, and each entry begins with a relevant quote. The quote for the Lord of Change entry?
-->''"Yesss! [[http://1d4chan.org/wiki/Just_As_Planned Just as planned!]]"'' -- Spoken by Xi’aquan, Lord of Change, in [[ThanatosGambit its death throes]]
* TheAtoner: Black Shields are generally this, Marines who join the Deathwatch and keep their home chapter a secret. Perhaps because the chapter has fallen and they are the SoleSurvivor, hoping to go out in glory. Or a Marine who was kicked out of his chapter for some failure, hoping to redeem themselves in the Deathwatch.
* AttackAttackAttack: Generally played straight by the Tyranids and the Chaos forces of the Stigmartus. In the case of the former, this is because their creatures are more like [[LivingWeapon complex biological munitions]] than troops, and in the latter because they are [[AxeCrazy too fanatical]] to care. However, this is averted by the Tau, who try fight with a mind for minimizing casualties (primarily their own and secondarily [[ApologeticAttacker those against whom they are fighting]]) and thus are more likely to [[TacticalWithdrawal fall back and regroup]] or [[PeaceConference parlay]] with a kill-team that can hold its fury a moment.
* BadassBookworm: Dark Angels characters, in addition to being {{Stone Wall}}s, are also this, since their chapter-specific advances have the most options for Scholastic Lore and Forbidden Lore out of any core chapter.
* BadassCrew: ''Deathwatch'' characters get squad-based abilities that improve their effectiveness while they're working together as a cohesive unit.
* TheBerserker: Blood Angels characters tend towards this, unsurprisingly. Their Chapter-specific abilities revolve around hitting better and harder in melee, and taking fewer Wounds by virtue of simply [[FeelNoPain not feeling any pain]].
** [[NamesToRunAwayFromReallyFast The Flesh Tearers]] (a Blood Angels successor Chapter given rules in ''Rites of Battle'') are [[UpToEleven even worse]]; with the right combination of talents and wargear, they can bring down boss-level monsters in one or two rounds of combat, simply due to the insane bonuses they get from charging and the raw power their many MANY attacks provide.
* {{BFG}}: Oh Lord, yes. A Space Marine's bolt pistol sidearm actually deals more damage per shot than the ''heavy'' bolters available to ''DarkHeresy'' and ''RogueTrader'' characters, and it goes up from there. (This discrepancy is justified in-universe by saying that these guns were originally designed for the Space Marines in the first place, and that everyone else in the Imperium is using [[WellIntentionedReplacement knock-offs scaled down for ordinary human use]].) Errata 1.1 introduces alternate weapon rules that scale the bolters back a bit -- and make several of the Marines' other guns even ''nastier''.
** They STILL out-damage mortal heavy bolters even after the errata...but only by 1 point of damage.
* {{BFS}}: The Sacris Claymore, signature weapon of the Storm Wardens, is a sword big enough that a ''Space Marine'', a seven-foot tall killing machine that can bench press a truck, needs two hands to wield it effectively. The Power Claymore described in ''Rites of Battle'' is basically the same thing with a [[LaserBlade power field]] wrapped around it, and the Relic Blade is an even bigger and nastier version of ''that''. It's also worth noting that every Space Marine's standard-issue combat knife deals more damage than the basic swords available to most other folk (or at the very least the same amount of damage, if using the optional weapon rules from Errata 1.1).
* BlackKnight: ''Rites of Battle'' details the "black shields", Astartes who forsake their Chapters of origin and dedicate themselves to the Deathwatch.
* BlingOfWar: Chapter Trappings of various sorts, which have in-game rules effects, and Honours, which are primarily a roleplaying device.
* BraveScot: The Storm Wardens chapter of Space Marines (original to this system) recruit exclusively from a world populated with Scotland-esque highland warrior clans [[RecycledInSpace IN SPACE]].
* BugWar: ''Deathwatch'' characters are likely to find themselves in the middle of one of these, courtesy of the Tyranids. Examples include the free quickstart adventure, ''Final Sanction'', and the introductory adventure given in the core rulebook, ''Extraction''.
* CharacterAlignment: The Demeanour system is a variation on the concept. Each marine will have a certain set of core values indoctrinated into him by his chapter, representing one core Demeanour, and an additional Demeanour which is specific to him as an individual. These exist partly as roleplaying aids, but a character who is acting "in-character" with a particular Demeanour can trigger that Demeanour once per session, and gain bonuses by doing so. If the roleplaying of it is particularly well done (subject to other player's approval) those bonuses are increased. In this way the player is incentivized to roleplay effectively and leverage that roleplaying to invoke a personal SugarWiki/CrowningMomentOfAwesome.
* ColonyDrop: The most major act of rebellion the [[LaResistance Vengeance Sept]] has been able to accomplish was a SuicideMission to hijack the Imperial cargo ship the ''Silent Pilgrim''[[note]]([[MileLongShip and even the smallest of interstellar ships are measured in kilometers]])[[/note]] and crash it into the fortress world of Spite, the headquarters of the Canis Salient. They were wide of the actual military center, but their target was instead a major fault line in the crust of the planet. The impact caused massive earthquakes across the entire continent.
* CoolGate: One of the main objectives of the crusade into the Jericho Reach (the main setting of the game) is to secure a warp gate that leads to the other side of the galaxy. Conveniently, this also allows ''Deathwatch'' to cross over with the default campaign settings for ''DarkHeresy'' and ''RogueTrader'', despite the literally astronomical distances between them.
* CripplingOverspecialization: The Kill Team themselves, at low levels at least. Each Space Marine is trained, enhanced, and equipped for a singular purpose: slaying the Emperor's enemies, and every brother freshly seconded to the Deathwatch is already exceptionally good at it. However, the Deathwatch requires marines to enter situations where things like diplomacy, investigation, and less-than-lethal force may pay bigger dividends for the Imperium as a whole than straight combat would, yet are still too dangerous, volatile, and critical for mortals for take on. As a battle brother serves with the Deathwatch, he gets opportunities to learn new ways of approaching obstacles, and becomes as more well-rounded champion of the Emperor. Many official adventures recommend they be used for characters with a few levels already, not because the combat is more dangerous (though it may be) but because it will benefit from a more general set of skills that a more junior group might lack.
* CrowningMomentOfAwesome: Invoked, by name and link, as a goal of the Demeanour game mechanics.
* DeathOfAThousandCuts: The Horde rules allow even [[{{Mooks}} the puniest of enemies]] a chance to pull down Space Marines through sheer, overwhelming numbers.
* DarknessVonGothickname: Lord Commander Sebascore Ebongrave. Though in [[TabletopGame/{{Warhammer40000}} this setting]] that could double as AwesomeMcCoolName.
* DyingMomentOfAwesome: The game provides rules for this; see HeroicSacrifice, below.
* TheEngineer: Techmarine class characters in a Kill-Team virtually always fall into the ''Combat Engineer'' subtype. Not only can they help other marines field-repair damage to their armor and keep any vehicle they may be using operating far from friendly lines, their ability to manipulate anything high-tech the Kill-Team comes across can be extremely useful. On top of that, a techmarine is no more squishy (and often much ''less'' squishy) than other marines, and can more than hold their own in a fight.
* EnemyMine: The Achilus Crusade was originally intended to drive the Tau from the worlds of the Jericho Reach. Following the arrival of Hive Fleet Dagon in the Reach, certain Imperial commanders and Tau leaders have suggested temporary alliances in order to stand against the Tyranid threat. The Tau Commander Flamewing exemplifies this mindset.
* EvilCounterpart: Most of the foes that a kill-team will face are either hordes of weaker enemies that they will have to push through, or smaller numbers of very powerful enemies that they must overcome with cleaver teamwork. However, kill-teams operating in the Acheros Salient for any length of time will sooner or later run into Chaos Space Marines, who can match the kill-team for combat potential. In a setting where battle-brothers are expected to be powerful paragons of war, [[MirrorMatch foes who are so similarly skilled and equipped]] make for a unique and deadly challenge.
* FearlessFool: The fear rules of the system are still in place, but Astartes react to them differently than other characters. Confronting a horrific foe might reduce their willpower a bit, or make working as a team more difficult, but it will never cause them to flee in terror, feint, or abandon their duty. However, a kill-team who is counting on an Imperial Guard company for backup against a terrible enemy might have to deal with suddenly find their backup [[ScrewThisImOuttaHere absent at an inopportune moment...]]
* FireForgedFriends: The rules are structured with the assumption that a starting Kill-Team will have been just formed, with each PlayerCharacter freshly seconded to the Deathwatch from their home chapters. As they work past their differences in ideology and combat style and learn to work effectively as a team, the Cohesion mechanic comes into further prominence, allowing their [[PowerOfTrust mutual trust]] and [[PowerOfFriendship knowledge of each other]] to execute impressive bonus maneuvers that none of them could accomplish singly.
* FiringOneHanded: This has always been possible in the system, but Deathwatch makes it ''practical''. Astartes PowerArmor negates the normal penalty for firing a basic-class weapon (a longarm) with one hand instead of two. This is pretty essential for any character using a single PowerFist or [[WolverineClaws Lightning Claw]], as those weapons preclude holding another weapon with that hand.
* FoeTossingCharge: An Assault Marine with the right Talents (Thunder Charge, Whirlwind Attack, Preternatural Speed, Lightning Attack, Wrathful Descent) can easily perform one, annihilating an entire Horde within a five-second turn of combat.
* FromBadToWorse: Very likely to happen -- the Deathwatch doesn't get sent in until things get ''a lot'' worse than usual in the CrapsackWorld of 40K.
** The Jericho Crusade is like this. They thought they found a few a few xeno-corrupted worlds, then it turned out to be a powerful Tau base. They thought they were facing a few scattered heretics and then it turned out there was a massive Chaos presence. Then the Tyranid hive fleet showed up. Then, as of the latest expansion book, a whole Necron empire is waking up well behind the front lines with the power to take all the other factions on at once...
* GeneralRipper: Lord Commander Sebiascor Ebongrave, leader of the Canis Salient of the Achilus Crusade fighting the Tau across the Greyhell Front. He rose to his position after the previous Canis Salient Lord Commander was assassinated by a Tau-sympathizer at the same time that xenophile organized rebellions hit several Imperial worlds that the Crusade had already conquered and assumed secure. The final straw was when a group of Tau sympathizers claimed credit for nearly annihilating his headquarters on a fortress world via ColonyDrop with a captured starship. Trying to avoid his predecessor's fate, Ebongrave began a great program to purge the population of xenophiles, [[PropagandaMachine aggressively propagandize the Imperial anti-Tau cause]], and eliminate any potential Tau-sympathizer's from his own staff. Unfortunately, as forces have been diverted to deal with more pressing threats of the [[BugWar Tyranid incursion]] and the Imperial offensive against the Tau have ground to a stalemate, his normally commendable zealous hatred of xenos and their sympathizers has gone into full paranoia. [[ConspiracyTheorist He sees Tau conspiracy]] all around him, resulting in [[CrushingThePopulace brutal crackdowns on planetary populations]] and public executions on even the merest rumor. Members of his own staff who suggest brokering a cease-fire with the Tau to [[EnemyMine better deal with more pressing threats]] are quickly [[ReassignedToAntarctica reassigned to the front line]] or [[YouHaveFailedMe executed]], resulting in Imperial forces being tied down and occupied in a demoralizing quagmire of a conflict.
** As much as they hate him holding up the peace process, the Tau have found him useful in other ways, as his continuing brutal actions are excellent propaganda for recruiting other humans ''their'' side. Harsh on the human populations as his crackdowns may be, also this means more military resources are devoted to suppressing the human population and less to fighting the Tau, giving them more time to dig in and build their strength. This aspect has the crusade's higher leadership disapproving of Ebongrave's approach, as the loss of Imperial momentum could cost them the conflict.
** Ironically, his paranoia of conspiracies against him has actually ''spawned'' several conspiracies against him. Many on his staff know that he is too zealous and proud to appreciate the reality of the situation, and so they try to broker limited cease-fires with the Tau in secret while keeping a pretext of persecuting the campaign against them. The Deathwatch actually ''excludes'' him from most of their operations, only cooperating with him when convenient to keep him reassured he has their support while keeping the rest of their operations clandestine. Even the Inquisition is plotting to have him suitably removed at some point. See VetinariJobSecurity for why this has not happened yet.
* GeniusBruiser: The Storm Wardens get a nice +5 to their strength, and they pride themselves on being excellent warriors. They're also friends with the Techpriests and view scholarly pursuits just as worthy as praise and glory as skill in battle (preferably both).
* GovernmentConspiracy: As first mentioned in ''TabletopGame/DarkHeresy'', the Margin Crusade, a war of faith driven by the Ministorum into the Halo Stars from the Scarus, Calixis and Ixaniad sectors, which continues to this day but [[HopelessWar has made little progress and contact with those sent to it is inevitably lost]]. However, ''Deathwatch'' [[TheReveal reveals]] this crusade to have been largely a lie all along, as a way of getting resources into the Achilus Crusade. The presence of the [[CoolGate warp gate]] between the Segmentum Obscurus and the Jericho Reach is a closely guarded strategic secret, and thus the pretext was needed to get the necessary forces mustered without the information of it being leaked. Even most of the people fighting and dying in the Achilus Crusade know not for what they are really fighting, believing themselves to be sent on a holy war for the Ministorum, never even realizing that they are on the far side of the galaxy from where they started.
* TheHero: While all Space Marines are heroic (in the classical sense, if nothing else), Tactical Marines fit the trope best. Their abilities tend to skew towards leadership and command, with a secondary role as the JackOfAllStats.
* HeroicSacrifice: There's even a mechanic for it. A Marine can forfeit his last 'get out of death free' ticket (Fate Point) to receive about a minute's worth of near-invincibility after which he's irrevocably dead.
* HighlyVisibleNinja: Most battle-brothers are actually fairly skilled at remaining unseen and silent, as most chapters will have them serve in scout companies before being elevated to full battle-brothers, in addition to being trained to carefully spot others hiding [[ProperlyParanoid for potential ambushes]]. However, while wearing Astartes PowerArmor, a battle-brother receives significant penalties to his ability to hide or move quietly due to the bulk of his armor and the noise it makes while moving. Any battle-brother trying to stay undetected will fall squarely into this unless he takes great pains beforehand to wear something other than his iconic armor.
* HopelessWar: The Achilus Crusade seemed quite promising when it began as a military venture to re-take Imperial worlds that had been isolated for a few millennia due to warp storms, where re-established Imperial control would form a buffer against the Tau Empire's expansion into the sector. When Lord Militant Achilus' ship suffered a geller field failure in-warp, the crusade was split into three fronts, but fate was not kind to the new strategy:
** The forces earmarked to combat the Tau now find themselves [[GeneralRipper commanded by a man]] who routinely purges his officer ranks for xeno-sympathizers and refuses to allow forces to be transferred away, pushing into Tau space with a commendable but poorly-timed zeal. He attributes the lack of progress on this front to [[ConspiracyTheorist Tau conspiracy]] to subvert the forces under him and incite planetary populations to rebellion, when in fact his heavy-handed crackdowns still his efforts as much as any Tau influence does.
** The forces trying to solidify the Crusade's hold on worlds which had fallen to petty warlords during the Age of Shadow now find themselves fighting the forces of Chaos whom those warlords fell in with during the Imperial advance, and the worlds themselves are [[WarIsHell meat-grinder warzones]] in which [[WeHaveReserves thousands die on each side daily]] to take and recover [[WasItReallyWorthIt a few meters of ground]].
** Finally, the crusade's other arm, which had been successful and untroubled up to now, has been set upon by [[BugWar Hive Fleet Dagon]], which grows stronger with [[PlanetEater each world it consumes]] and threatens to overrun the entire crusade as [[UnstableEquilibrium equilibrium swiftly turns in its favor]].
*** And did we mention that the base of the Deathwatch [[spoiler:is a [[AbusivePrecursors Necron]] Tomb-World, with its inhabitants already stirring? Because that seems important.]]
* HotBlooded: One of the example 'demeanours' during character generation; demeanours allow players to gain mechanical bonuses via roleplaying their Space Marine according to their stated behaviour traits -- a HotBlooded Squad Leader might give a rousing (and/or [[LargeHam hammy]]) speech before battle, for instance, or a Pious Marine might always have some [[AsTheGoodBookSays scripture-esque quote]] for any situation.
* HuntingTheMostDangerousGame: The heretek Magos Phayzarus from ''Mark of the Xenos'' takes this a step beyond the norm, hunting Space Marines in order to consume their precious gene-seed. This is a ''major'' BerserkButton for any Space Marine worth the title.
* IconicItem: Normally equipment must be requisitioned from the Deathwatch armory and surrendered to the quartermasters after missions. The Signature Gear talent allows a character to keep a particular piece of wargear on hand as "theirs" rather than going through the normal requisition channels. Purchasing this talent multiple times allows items of greater rarity to be kept, expanding the amount of wargear available to a battle-brother when they do requisition.
* ImplacableMan: Any battle-brother wearing Terminator armor becomes this, having protection equivalent to a force-field that never overloads, plus one of the highest armor ratings available, gaining strength even above what is normally available to Astartes PowerArmor, and allows heavy weaponry to be [[FiringOneHanded fired singled-handedly. ]] It [[UnflinchingWalk restricts the wearer from running]], imposes a penalty to his agility, makes him incapable of dodging attacks, requires the highest levels of renown, and has a truly staggering cost in requisition for both the armor ''and'' a separate mandatory amount of weapons.
* IncorruptiblePurePureness: The Astartes themselves are expected to play this very straight. TheCorruption mechanic in the system is still in play, but Astartes will not suffer its negative effects until crossing the final threshold at which point they are considered "[[FallenHero fallen]]" and will be dealt with swiftly and harshly. However, an Astartes who gets more than a handful of corruption points will be looked on with deserved suspicion by his peers, and the rulebook advises the [=GM=] to give them out when they need to remind the players of who their character's are and what is expected of them.
* ItsAllAboutMe: Ultramarines who become insane automatically cop this attitude.
* JackOfAllStats: The Ultramarines, as usual. While Marines of other Chapters get to add a bonus to two specific abilities, Ultramarine characters get to pick which two abilities to improve.
* LaResistance: The "Vengeance Sept", a collection of Tau sympathizers across the Greyhell front. Unlike the more random actions of smaller groups who read some Tau propaganda and rabble-rouse, the Vengeance Sept are a well organized network of cells, in contact with and actively supplied by the Tau, occasionally taking drastic action to impede the Imperial war effort.
* LeaveHimToMe: The Storm Wardens' Thunder's Call ability allows them to invoke this against a single enemy per combat. The rest of the Kill-team is generally expected to kill everyone else in the room while the boss is occupied.
* LeeroyJenkins: Brother Szobczak was once a [[TheEngineer techmarine]] of the Imperial Fists. Now, [[ManInTheMachine he is a venerable dreadnought]] in service to the Deathwatch. He is awoken from a stasis repose in the Omega Vault during the events of ''Rising Tempest'', and insists on being able to accompany the Kill-Team on their mission. He is certainly powerful, and has a great deal of experience with siege breaking and technology. Unfortunately, he is also [[GrumpyOldMan extremely cantankerous and dismissive of modern Space Marines]], thinking that [[WhenIWasYourAge modern ones are too cowardly and undisciplined and that they were all better back in his day]]. He is also [[HairTriggerTemper prone to fits of rage]] and [[ScrewPolitenessImASenior getting into shouting matches with those he disagrees with]], and is likely to fly off the handle in the face of the enemy and [[AttackAttackAttack charge into their lines like he was breaching a fortification]], making any attempt at stealth or subtly impossible.
* LightningBruiser: The Assault Marine -- strong and tough as any other Space Marine, able to make two melee attacks straight off the bat, and thanks to his [[JetPack Jump Pack]], very, ''very'' fast.
** [[http://suptg.thisisnotatrueending.com/archive/15141246/ The right character build]] can take this UpToEleven with a two-ton, {{Powered Armor}}ed SpaceMarine who can sprint at a theoretical rate of nearly three-hundred miles per hour. That is going to do some serious damage to whomever he crashes into...
* MagicKnight: The Librarian character class is this in a nutshell. While they are spell casters with plenty of offensive and utility power, they are no more [[SquishyWizard squishy]] than any other Astartes, walking around in full PowerArmor and trained in physical combat as much as they are in psychic combat.
* TheMedic: The [[ExactlyWhatItSaysOnTheTin Apothecary]], whose abilities mainly center around healing and boosting the performance of his Kill-team. Can also learn to create toxins. Kind of subverted in that Apothecaries are no more squishy than other Space Marines.
* MilitaryScienceFiction: More so than the other two 40k roleplaying games, since characters in ''Deathwatch'' are specifically intended to engage in military operations and deal with military-grade threats.
* MoreDakka: Devastator Marines. Much like a well-built Assault Marine, a well-built and well-equipped Devastator Marine can destroy an entire Horde of enemies in a single turn (though the latest round of errata has scaled this back significantly).
* NegativeSpaceWedgie: The Jericho Reach has a few of them:
** The Hadex Anomaly, a warp/real space overlap created centuries ago by some massive act of ritual sorcery. [[YearInsideHourOutside Time flows differently]] in there, and as a result Chaos-held worlds there can have a generation born, grown, trained, and formed into warbands in only a few years of objective time, which negates the Imperium's [[WeHaveReserves primary resource advantage]], and ensures that the fighting in the Cellebos Warzone is particularly bitterly fought just to maintain a stalemate.
** The Black Reef is an area of strange gravity disruptions that makes faster-than-light travel more dangerous the closer to it one goes. It forms a natural divide between Imperial controlled space on one side, and Tau controlled space on the other. Both sides must go around the Reef rather than through it, forming a chokepoint for both factions. Due to differences in the way that they use FTL travel, the Tau can approach closer to it more safely than the Imperials can, but their slower travel limits that advantage.
* OneOfUs: The FFG [[http://www.fantasyflightgames.com/edge_news.asp?eidn=1321 newspost on Demeanours]] includes a link to the CrowningMomentOfAwesome page.
* OneManArmy: Deathwatch Kill-Marines, introduced in the ''Rites of Battle'' supplement, are specialists trained to perform solo missions without the support of their battle-brothers.
* ThePaladin: The player characters are this exclusively. Astartes are indoctrinated to be above certain mortal concerns, and one who deviates too seriously from this is going to be looked on with suspicion by his battle-brothers. In addition, each chapter has its own particular sets of values and ideals for how an Astartes should behave, adding diversity to how this trope is played.
* ThePerfectionist: The Iron Hands' Primarch's Curse turns them into this; mixed with JerkAss and InsufferableGenius.
* SanitySlippage: The insanity mechanic of the system affect's Astartes differently than it does other humans. Rather than being affected by more random psychosis, increasing insanity points manifest in a battle-brother as a kind of [[{{Flanderization}} exaggeration of the negative stereotypes]] associated with their respective chapter. This is know as the Primarch's Curse. How they learn to live with it is the measure of a veteran Space Marine:
** Black Templars become increasingly fanatical about their hatred for psykers, making interaction difficult and potentially going against better judgement to try and slay them, even if the mission says otherwise.
** Blood Angels have more difficulty distinguishing between reality and their GeneticMemory of their primarch's demise. As this mounts, they have a more difficult time controlling their (sometimes literal) BloodLust and [[LeeroyJenkins might break ranks to engage the enemy up close]].
** Dark Angels become more [[LonersAreFreaks aloof and self-isolating]], becoming paranoid about others trying to pry into their secrets, distrusting all except other Dark Angels.
** Space Wolves become more savage in their appearance and manner, disturbing others, get overpowered by the scent of their enemy's blood, and have difficulty backing down from a fight, even when a TacticalWithdrawal would be the best option.
** Storm Wardens have difficulty managing their [[GlorySeeker thirst for glory]], and exaggerates their tendency to place HonorBeforeReason, refusing to back down from a challenge and trying to fight "fair" even when victory would be more important their their personal honor.
** Ultramarines feel increasingly convinced that they are the Imperium's favored sons, making sure that the kill-team goes where the fighting is thickest, and become convinced that others cannot be trusted to do what is "right" in all circumstances, eventually refusing to follow the leadership of anyone other than another Ultramarine.
* ScarilyCompetentTracker: Space Wolves get bonuses that lend themselves well to tracking and infiltration, filling an advanced scout role.
* SealedEvilInACan: The Ghanathaar were a race that once dominated the region of space that would become the Jericho Reach eons ago, using their powerful psychic abilities to mentally dominate other races into obedience. However, a great and terrible threat emerged, though it has long since been forgotten, that forced the Ghanathaar to go into hiding. They built gates to shelter themselves in the Warp, intending to re-emerge once the threat has passed, only to find themselves trapped on the other side, slowly driven mad by their time in the Empyrean. For ages they waited, going further insane and corrupted all the while, until [[NaiveNewcomer the Tau]] eventually moved into the neighborhood. A few psychic whispers convinced the Tau that [[ManipulativeBastard the Ghanathaar wanted to join the Greater Good]] if the Tau could help release them from their imprisonment. Sadly, the [[UnwittingPawn Tau do not know enough about the Warp]] to know that [[DidYouActuallyBelieve they should not trust the whispers that come from it]]...
* ShoutOut: The ''Deathwatch'' writers are not shy about reaching out to other works in the franchise:
** The basic rulebook has a quote from Commissar Holt of ''Warhammer 40,000: Final Liberation'' fame.
** The Expanded Wargear chapter in ''Rites of Battle'' has an opening quote also from [[http://www.youtube.com/watch?v=LOi3CzZjV0M Commissar Holt]].
** The basic rulebook also has a few quotes from [[VideoGame/DawnOfWar Captain Davian Thule]] of the BloodRavens.
** A section citing a few examples of notable Imperial Guard regiments mentions the masterful stealth skills of the [[Literature/GauntsGhosts Tanith First and Only]].
* SpaceMarine: Of the Warhammer 40,000 variety, of course, with [[WarriorMonk everything]] [[SuperSoldier else]] [[{{BFG}} that]] [[PoweredArmor implies]].
* StoneWall: Dark Angels characters tend towards this, with abilities that trade movement ability for heightened defenses, temporary Wounds and improved firing capabilities.
** Their Librarians even get a psychic power that lets them essentially become an actual stone wall, with massive amounts of armor as long as they don't move.
* SuicidalOverconfidence: Normally a video game trope, it is notable in this instance because the rulebook clearly advises the Game Master to '''not''' imitate the trope when running a tabletop game like this. The Deathwatch characters are more powerful than others from this setting, and virtually everyone they go up against will know it. It reminds the [=GM=] that even the most fanatical of foes who are [[DeathSeeker eager to die for their cause]] will still want to sell their lives as dearly as possible, and thus will be more likely to commit only from a position of strength rather than charge out to die without at least a chance of threatening the kill-team.
* SurvivalHorror: The official adventure ''The Ark of Lost Souls'' is explicitly described as such in a GM's sidebar early in the book. It plays this up by thrusting the Kill Team into a very dangerous situation [[OntologicalMystery suddenly and without any explanation or forewarning]], with [[EscapeFromTheCrazyPlace no obvious way out]], [[DroughtLevelOfDoom no opportunity to resupply]] so they must [[ResourcesManagementGameplay carefully count their stores and make every shot count]], in a vast echoing expanse that is [[NothingIsScarier largely empty but where dangerous creatures can lurk in any shadow]], full of DangerousTerrain, where they will be attacked by [[ZergRush waves upon waves of enemies]] that they have [[RespawningEnemies no hope of defeating all of]].
* TakeUpMySword: Astartes PowerArmor is difficult to manufacture, even for the Astartes, as each piece of it must be carefully crafted by artisan Tech-Marines. As a result of this difficulty, components from the armor of fallen marines end up being recovered and reused in new suits of armor provided to freshly raised battle-brothers. Many chapters develop elaborate rites and practices around this process, engraving pieces with the history of its wearers, and this is reflected in the armor of Deathwatch kill-teams. Each player must roll on a table to determine the history of their armor, and this history will give the armor its own set of (literal) mechanical quirks.
* TeethClenchedTeamwork: While not every Deathwatch kill-team has this issue, it does come up with Kill-teams formed of Astartes drawn from chapters with significantly different traditions. For example, the enmity between the [[TheStoic Dark Angels]] and the [[BoisterousBruiser Space Wolves]] is well known, Black Templars are likely to balk at having to work with a Librarian, and an [[TheCape Ultramarine]] is likely to have friction with any marine from a chapter that does not take the Codex Astartes as seriously as he does. As some Black Library books have commented, learning to reconcile the different traditions between chapters in the Deathwatch is one of the more unique challenges a Space Marine may have to contend with. ''Honour The Chapter'' presents several more examples, such as a rivalry between the Space Wolves and the [[VideoGame/DawnOfWar Blood Ravens]] due to the latter's excessive use of psykers (as the Wolf Lord demonstrated to the Blood Raven Captain with [[TalkToTheFist a punch in the face]].)
* TouchedByVorlons: The background book ''The Achilus Assault'' heavily implies that [[spoiler: Tiber Achilus, the Lord Militant who was the organizer, original leader, and namesake of the Achilus Crusade, had (unbeknownst to him) indirect help from the Eldar. They were present when he was born, always seemed to observe him during his near-miraculously meteoric rise to greatness, and were seen shortly before his ship was lost the warp in an extremely routine trip while the rest of the fleet made it through fine. Exactly what influence they had and why they seemed interested in this particular Imperial commander is unknown.]]
* TwistingTheWords: Kill-teams operating in the Acheros Salient are known to come across quotations from the Codex Astartes, [[CouldntFindAPen written in blood]] near the scene of a massacre by Word Bearers [[EvilCounterpart Chaos Space Marines]]. These quotations are deliberately taken out-of-context, twisting the meaning to imply justification for their gruesome actions. [[ForTheEvulz They do this purely to spite the Astartes who find it]].
* UpToEleven: ''Deathwatch'' is this to the other ''[[TableTopGame/{{Warhammer40000}} Warhammer 40,000]]'' [[TableTopGame Table Top]] {{Role Playing Game}}s. Especially combat mechanics, where {{Player Character}}s start at the highest end of the power scale for the other ones and only go up from there. However, no matter how powerful the Kill-Team is, they will always be going up against foes at least one step up from that, some of whom are so powerful that the Battle-brothers will be forced to rely more on their wits, guile, and teamwork to triumph rather than their prodigious combat strength alone.
* VetinariJobSecurity: [[GeneralRipper Lord Commander Sebascore Ebongrave]] is seen by many in power as a danger to the Imperium's interests in the Canis Salient. Whether because they see him as cowardly for his fear of [[ConspiracyTheorist xeno-sympathizer conspiracies]], his unwillingness to [[PeaceConference meet the Tau halfway]] so they can [[EnemyMine confront higher priority threats]], or even just the loss of strategic momentum the Imperium suffers by devoting so many of their forces to [[CrushingThePopulace enforcing a police state on the local populations]]. However, Ebongrave has a wide influence, troops loyal to him alone, and enough money and personal connections to hire lots of mercenaries. This influence combined with his knowledge of things classified near to the crusade high command and his unstable nature, along with the power vacuum that would need to be filled and a volatile political situation, means that simply retiring him is difficult and must be handled extremely carefully.
* VisibleInvisibility: Masking Screens, small devices attached to the shoulder which dampen the wearer's noise and project an active-camouflage effect on their armor. They are reverse-engineered from the cloaking generators captured from Tau [[InvisibilityCloak stealthsuits]], but being unable to completely reproduce them without the "xenos-taint" makes the technology imperfect, only modestly improving a battle-brother's ability to hide over [[HighlyVisibleNinja the brightness and noise of his armor]] and imposing a penalty to his perception of objects outside the narrow effect of the screen.
* WalkingTank: The ''Rites of Battle'' supplement allows for player characters to be interred in Dreadnoughts. However they have to be near death and of high level and renown.

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