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A trilogy of novels in the Franchise/StarTrekExpandedUniverse, an epic time-travel adventure featuring the characters of ''Series/StarTrekDeepSpaceNine''. It doesn't fit entirely into the modern continuity, but given the themes of myriad alternate realities and interlinking timelines, that isn't a problem either way. The three books are ''The Fall of Terok Nor'', ''The War of the Prophets'' and ''Inferno'', and the plot involves a full-scale religious war erupting in an alternate future timeline, the result of an attempt by factions of the Wormhole Aliens to reunite their splintered civilization. Unfortunately, success will mean the end of the universe.

The trilogy shares a great many plot points with the Deep Space Nine computer game, ''The Fallen''.
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!!This series contains examples of:

* ActionGirl: She's a bit older than most, but Vash counts. Her Andorian rivals, Satr and Leen, are [[DarkActionGirl Dark Action Girls]].
* {{Affably Evil}}: Weyoun, most of the time.
* {{After The End}}: Book Three, ''Inferno'', takes place [[spoiler: after the end of the entire universe]]. It's complicated...
* {{Alien Arts Are Appreciated}}
* {{Alternative Calendar}}: A reasonably important plot point concerns a possibly non-coincidental similarity between multiple cultures' otherwise distinct calendars.
* AnyoneCanDie: Once we're in the alternate future, any character encountered (no matter how familiar or otherwise protected by ContractualImmortality) can die. In fact, most do.
* BadassPreacher: Obanak Keelen.
* BigBad: At first it looks to be Weyoun. Then...things get complicated.
* {{Bizarre Alien Biology}}: The Grigari appear to be a mechanical-organic construct. No-one is sure whether they should be categorized as living beings or an artificial intelligence. They leak a substance that might be blood, or might be cooling fluid.
* BlatantLies: When Dr. Bashir asks Garak to aid him in identifying two recently-discovered bodies, Garak responds: “Oh, Doctor, I'm afraid that in matters of mysterious deaths, I am entirely bereft of experience”. No-one is amused.
* {{Blessed With Suck}}: Anyone corrupted by Grigari nanites; they give the host superior strength, regenerative abilities and other powers, but also reconfigure their brain, making them compliant servants of the pah-wraiths.
* {{Body Horror}}: Bions - the lobotomized, bio-augmented slave soldiers used by the future Romulan Empire. It's suspected they are former prisoners mutated using Grigari technology.
* BrainFood: The Medusans, apparently. Quark has certain recipies programmed into the food replicators (quite illegally), should he ever get a visit from a Medusan delegation.
* {{Brainwashed}}: Weyoun, having been freed from his genetically mandated loyalty to the Founders, doesn't realize he has simply been transferred to a new master in the Grigari.
* TheChessmaster: Obanak Keelen is possibly the finest example in the ''Franchise/StarTrek'' universe. He sets into motion a plan that involves muliple timelines, several realities, and the end of the universe, manipulating not only the heroes and villains both but also his own gods.
* ChurchMilitant: Pretty much everyone in the alternate future. They even have a warship named the ''Opaka'' (which ''really'' alerts the time-displaced heroes that something is wrong, because Opaka was a woman of peace and preached a non-aggressive, tolerant faith).
* {{Cool Ship}}: In the alternate future, the Timeship ''Phoenix''. Also from that future, the ''Enterprise-F'', though it ended up being [[AnyoneCanDie obliterated in the first eight minutes]] of the battle to save Earth from the Grigari.
* TheCorruption: Grigari nanites.
* {{Cosmic Keystone}}: The Red Orbs of Jalbador. When all three are brought together in one place, they open [[spoiler: the second Bajoran wormhole]], which, along with the better known one, are the two sides of [[spoiler: the dimension wound which 'reality' sit on top of, meaning if they ever touch, the result will be...nothing. Literally, nothing will exist, and nothing will always have existed. There never will have been even a place for the universe to have happened ''in''. This, of course, proceeds to happen at the end of the second book.]]
* CrapsackWorld: In the alternate future, Earth has been destroyed by the Grigari, its colonies wiped out by nanoplagues, humans, Klingons and Cardassians are all nearly extinct, what's left of the crumbling Federation is at war with the Bajoran Ascendancy, which worships the Pah-wraiths and is led by [[spoiler: Kai Weyoun]], and ''his'' ultimate goal is to destroy the universe.
* CulturalPosturing: A Bajoran mentions how her people were architects and artists when "Cardassians were still swimming through swamps catching fish in their mouths".
* {{Dangerously Genre Savvy}}: Weyoun. Garak, too, though he doesn't act on the observations he makes, having decided that since Cardassia no longer exists in this future, he has nothing more to fight for. He basically sits this one out, and spends most of his time calmly and somewhat cheerfully making GenreSavvy comments to annoy Odo.
* DysonSphere: In the alternate future, O'Brien is trapped in one of these for what seems like years, as the FateWorseThanDeath meted to him by the Pah-Wraiths.
* EarthIsTheCenterOfTheUniverse: Averted. This being ''Series/StarTrekDeepSpaceNine'', Bajor seems to be the center of the universe instead.
* {{Earth Shattering Kaboom}}: [[spoiler: Bajor is vapourized in the alternate future - all part of Kai Weyoun's plan. Earth met the same fate some years prior]].
* EnemyMine: The Grigari are so terrifying that the Borg and the remnant Federation are allies in this timeline. It doesn't even seem to be TeethClenchedTeamwork; they're engaged in peaceful technological exchange.
* FateWorseThanDeath: Dukat and Kosst Amojan trap the heroes in recurring personal nightmares in order to gain their co-operation. Basically, they trap them in personal hells, sometimes along the lines of AndIMustScream. Unfortunately for Dukat, it doesn't work on Dax; her multiple lives confuse the Kosst Amojan, which tries creating multiple hells that then just blend together confusingly and lose their horror, allowing her to break free. And Garak isn't impressed by the technique - his hell certainly works on him, but Dukat is frustrated to see that he isn't actually afraid - exhausted, drained, horrified, yes; but nowhere near ''afraid''.
* FromBadToWorse: Deep Space Nine is destroyed and the heroes are flung decades into the future - that's the end of the first book. In the second book, they discover that this future is a CrapsackWorld where Starfleet is a ChurchMilitant organization fighting an interstellar doomsday cult, led by [[spoiler: Kai Weyoun of Bajor]]. Then they discover this doomsday is ''real''...and that the enemy is planning to destroy the universe.
* GambitRoulette: Everything that happens in the trilogy unfolded according to Obanak Keelen's plan. ThePlan involved blowing up the universe and then helping the universe [[UnexplainedRecovery recover]]. It also involved using the gods themselves as pawns. [[note]] The Wormhole Aliens are only gods to the Bajorans- but Obanak ''is'' a Bajoran[[/note]].
* TheGodsMustBeLazy: The pah-wraiths are ''far'' more proactive than the Prophets. This is actually justified - the Prophets' best bet for protecting the universe is to keep their distance and remain apart from the mortal/temporal realm, while the pah-wraiths want to bridge the distance and reunite with their brethren, even though it means destroying creation.
* GodzillaThreshold: Not only has the Federation made allies of the Borg, they're engaged in multiple attempts to alter the timeline despite several reasons to think this is a bad idea and have suspended the Prime Directive to allow an invasion of the Mirror Universe in hopes of creating a safe haven there.
* TheGreys: Implicitly, the Reticulii.
* IBelieveICanFly: Weyoun can levitate, thanks to the Wormhole Aliens.
* ImpossiblyCoolWeapon: The electric mini-''bat'leth'' wielded by [[TheNapoleon Base]].
* LargeHam: We can't actually hear him, of course, but there's ''no way'' Kosst Dukat isn't this.
* LossOfIdentity: To Jean-Luc Picard, of all people. By 2400, his Irumodic Syndrome has progressed to the point where he has lost almost all contact with reality, forever having imaginary conversations with his long-dead friends from the ''Enterprise-D''. [[CrapsackWorld And he's basically in charge of Starfleet.]]
* MissingTime: Neither Odo, Quark or Garak can recall what happened the night of the Cardassian withdrawal from Terok Nor. Quark is the only one who will admit it, though. His attempt to find answers irritates Odo and Garak, who refuse to discuss or acknowledge that they're in the same situation.
* MySpeciesDothProtestTooMuch: Arla Rees. A Bajoran atheist, she is actively and somewhat obsessively opposed to her people's faith, believing the Prophets to be conquering aliens who have stunted Bajoran culture in order to keep them passive and compliant. She bitterly acknowledges how at odds she is with the rest of her people, saying that sometimes she thinks she's the only one who "sees it".
* {{Nanomachines}}: The Grigari use these; they serve as TheCorruption.
* TheNapoleon: Base, the world's smallest and most angrily homicidal Ferengi.
* NotSoHarmlessVillain: Future Weyoun is AffablyEvil, and also a little comical. He is not to be underestimated, though, and when he tires of the heroes' interference, he shows just how dangerous he is. He also managed to [[spoiler: destroy the universe]].
* {{Omnicidal Maniac}}: Dukat and Kosst Amojan. They aren't the only people out to destroy creation, but the others have far more sensical motives.
* ThePhoenix: The Romulans have a similar myth; in their culture, the flaming bird is Alth'Indor.
* {{Prophecy Twist}}: The Bajoran religious prophecies, along with the basic principles of the faith itself, were written [[spoiler: by refugees from the timeship ''Phoenix'' originating in another timeline, who crossed over into our timeline 30,000 years ago]].
* RetroactivePrecognition: Many of the more notable Bajoran prophecies, thanks to the Timeship ''Phoenix''.
* TheRightOfASuperiorSpecies: Leej Terrell considers the Bajorans little more than cattle, and refuses to accept that Cardassia was doing anything wrong in enslaving them. Indeed, she tells Sisko that humanity's biggest problem is its refusal to distinguish "truly sapient" races like the Vulcans from "stock" like the Bajorans.
* {{Rousing Speech}}: Amusingly, Weyoun doesn't feel the need to give one as the day of the final reckoning dawns.
* {{Scary Dogmatic Aliens}}: The Grigari, who are fanatical and deadly enough to scare the Borg. The Bajoran Ascendancy, which is one giant doomsday cult fighting to destroy the universe. The Wormhole Aliens, which are fighting a three-way war that threatens to tear the mortal realm apart. Even the newly Vulcan-dominated Starfleet. And we mustn't forget Kosst Dukat:
-->Can I have an Amojan?!!
* {{Sealed Evil In A Can}}: Kosst Amojan and his followers (the banished pah-wraiths cast from the Celestial Temple into the Fire Caves). However, the straightforward pah-wraith plotline of the TV series, which disappointed some fans in its bog-standard simplicity, is made far more complex here. For one thing, the Fire Cave pah-wraiths are not the only ones; indeed, they're a minority. They no more represent the pah-wraiths as a whole than they do the prophets.
* ServantRace: The Grigari seem to be servants of the Ascendancy, [[spoiler: yet are actually controlling Weyoun. However, they do seem to be genuine servants of the pah-wraiths]].
* SiblingTeam: The Andorian sisters Satr and Leen, in the first book.
* StableTimeLoop: The War of the Prophets is a stable time loop that transcends a single timeline, and connects multiple realities together. It's hinted in the epilogue that ''all'' timelines are linked, and ultimately part of a larger network, that might one day be explored just as the Federation explores space.
* TheVoiceless: Played with but ultimately reaffirmed for Morn. Just as Morn never speaks on screen, so the novels never give him dialogue (despite mentioning how he's actually a chatterbox). In the first book of this trilogy, it briefly looks like Morn has been giving dialogue as part of a CrowningMomentOfAwesome. Turns out it's actually Odo taking Morn's form.
* TrickedOutTime: The goal of Admiral Picard's ''Phoenix'' project. [[spoiler:It works -- and then the Ascendancy tricks out time right back.]]
* WeComeInPeaceShootToKill: This is used as a cover story by the Grigari in the alternate future. They "mistook Earth's intense sensor scans" for an attack, then "fired a warning shot" that they "didn't realize would overwhelm the planetary defenses". Result: EarthShatteringKaboom.
* WeaponOfMassDestruction: Quite a few in the CrapsackWorld future, including a nova bomb, nanoplagues and planet-destroying "deep time" bombs.
* WellIntentionedExtremist: Sisko wonders if Leej Terrell is this. At first she seems nothing more than a megalomaniac, but Sisko begins to consider if she's actually serious about her proposed "pax Cardassia". The golden age she says she's working for might be a genuine dream - not that it excuses her actions.
* WoundedGazelleGambit: Vash appears to have been hit by a toxic dart in an assassination attempt, and is rushed to the infirmary, unconscious. The poison is an Andorian neurotoxin, implicating the Andorians Satr and Leen, who are rivals to Vash (and particularly shady characters). It is not in fact fatal to Humans, though, and Vash fully recovers. She later mentions the toxin by name in a throw-away comment, alerting Bashir that she planned the whole thing - because he never mentioned the name, and there are dozens of neurotoxins it could have been. It turns out Vash injected herself with the dart.
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