Cavalier of the Abyss is the sequel series to ''Manhwa/ImmortalRegis'' by creator Ga On-Bi. The story returns to that of the mystical world of Chaos but brings in a new protagonist, the rash revenge-driven [[OurZombiesAreDifferent undead]] named Xix against the brutal Immortal Regis of Chaos, Nex, who was once known as [[FallenHero Jae Hyuk]]. Meanwhile [[DeadlyDecadentCourt various factions of the Regis' court]] and outside forces seem to be attempting to moves around the same time as Xix attempts assassinating Nex.

What happened in the past to make Chaos and Nex this way? Who or what is Xix and the origin of his mysterious abilities? What is the Clan of Night that wants to see Caladbolg unsealed?

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!!Tropes found in ''Cavalier of the Abyss'':

* AdmiringTheAbomination: Oski in a nutshell.
* AntiHero:
** Nex is a cold, bitter, ruthless, jaded tyrant! He's also trying to prevent [[BigBad Caladbolg]] and followers from bringing ruin to ''both'' worlds. This includes ordering entire villages executed because even one is infected.
*** FallenHero and BrokenHero.
** Xix is driven by his desire for revenge against Nex and is not afraid to play dirty, but a good person at heart.
* AntiVillain:
** Caladbolg, for all he is set up as the big bad, has had [[PetTheDog scenes where he is shown as less villainous than Nex]]. [[spoiler: The fact he has asked at one point for a stop to their conflicts and compromise seriously helps his case, even when he has ultimately selfish ends. ]]
* ApocalypseMaiden:
** At one point in the flashback Nex is told that if chooses Serin in the coming SadisticChoice, all hell will break loose.
** [[spoiler: Siana winds up being this for Banaan Village]].
* ArrangedMarriage: Yuan and Ninurta have one just set up at he beginning of the series [[spoiler: It doesn't last. ]]
* AsskickingEqualsAuthority: WordOfGod states that Nex is second in power only to Caladbolg.
** [[spoiler: Yuan's father, Yongje Yeonoh, Head of the Serpent Clan ]]
* BackToBackBadasses: [[spoiler: [[http://mangafox.me/manga/cavalier_of_the_abyss/v09/c053/17.html Xix and Just]]]] surprisingly.
* BerserkButton: Nex displays varying degrees of tolerance for the usual antics that go along with politics and court intrigue (i.e. plots, deceit, back-room deals, etc). Openly rebel against him however, and all bets are off; He '''will''' kill you, and anyone else who tries to stop him. [[spoiler: Thus-far, the only person to press this button and survive is Xix, and only because the palace was attacked right as Nex was about to decapitate him. That Xix is his long lost son may explain Xix's continued existence.]]
* BettyAndVeronica: Iffrita and Serin to Nex. Yuan and Siana to Xix.
* BigScrewedUpFamily: And ''how'':
** Nex is a cold, jaded tyrant with a sadistic side who ''massacres'' villages on a regular bases, doesn't even blink when Xix threatens to kill his son's fiance, and has Serin, previously his one true love, tied up in an ''eternal nightmare''.
*** Nex is convinced that he's surrounded by people who want to use or back-stab him. [[DeadlyDecadentCourt And he's right.]]
** Serin is locked in a box, heavily sedated, and subjected to an eternal nightmare, punishment for a major betrayal that has yet to come to light. Nex, however, cannot bring himself to killing her. Which of Nex's children she did or did not give birth to while running away from him are a major plot point. [[spoiler: Implied for both Siana and Xix so far.]]
** Caladbolg, supposed God of Chaos who [[PuppeteerParasite possesses and continues to identify]] as Jae-Hoon, Nex's little brother. Due to this, a large plot point is how there's no clear distinction between both personalities. Even though he is the BigBad he comes off [[AffablyEvil far more compassionate]] than Nex, acting as a foil. [[spoiler:Later it is shown he has taken Siana under his wing, who he confirms is his niece.]]
** Iffrita, Nex's wife and the queen, once sweet and a total ditz, now a BitchInSheepsClothing. She secretly hates the Demon clan for executing her mother as a political pawn, it's implied that she manipulated the events that led to Serin's internment and the razing of the Banaan village, and in court she's constantly maneuvering to get herself as close to Nex as possible.
** [[WellDoneSonGuy Ninurta Noah]], the prince and purportedly the son of Nex and Iffrita, although Nex is said to have accepted him without actually checking if this is true; it's implied he's actually the son of the queen and Mikhail Noah, as he bears little resemblance to his father. [[spoiler:Nex is [[TheUnfavourite not that fond of him]], and when he is captured by a dragon-bourn Siana, Nex orders his men to fire at him and declares him a traitor when he defends himself to survive. Currently a allied with Caladbolg of the Night Clan and possibly became RomanticRunnerUp to Xix, as his failed arrange marriage with Yuan but is shown to be developing ties with Siana. It's shown in later chapters he may in fact be Iffrita's second child, not her first as people are lead to believe, and the fact that Just uses his blood successfully for the blood seal ritual proves he is actually Nex's son after all.]]
** Ouroboros, also known as Just, claims to be the son of Nex and Serin as part of a ruse by Serin's father, and is a ManipulativeBastard who takes sadistic pleasure in tormenting his "brother" Ninurta.
*** Ouroboros is also the brother of Skoll, the wolf demon sealed inside Xix.
**** Technically all the beasts are related to Caladbolg, as they are created out of fragments of him.
** Xix: An Undead and HeartbrokenBadass whose entire village was massacred at Nex's orders, thus he has a death wish against Nex and is completely thunderstruck when he discovers that he may be Nex's son after a blood ritual. This after Nex defeats, tortures, and nearly kills him. [[spoiler: He was left at the village by a beautiful woman in flashbacks drawn looking like Serin and left with her family's artifact Semek. He was actually killed and then resurrected by Siana in previously mentioned massacre. After said resurrection, he proceeds in a daze to tear out Siana's heart and take it into his own body. ]]
*** Also the host of Skoll, a wolf demon related to Ouroboros the snake demon.
** Siana: ChildhoodFriends with Xix, and [[spoiler: member of the Night Clan]]. [[spoiler: She is also necromancer and like Xix implied to be the long lost child of Serin and an unknown Night Clan member that Caladbolg/Jae Hoon is convinced is Nex/Jae Hyuk. Xix thought she died when his village was destroyed, but in truth a [[CameBackWrong post-resurrection haze]] Xix tore out her heart to took it into his own body. Afterward her body was taken by Caladbolg and he had his forces work to save her. She reappears later in the present aligned with Caladbolg, and they believe each other to be uncle and niece. Her true body is with the Night Clan and she normally interacts via replicated one her consciousness is tied to.]]
** Miya: The only one to get away from this ''relatively'' clean. Indisputably Nex and Iffrita's daughter, she is a sickly little girl who cannot even comprehend how messed up her family is. Xix, Ninurta and Nex all care for her deeply (the former initially in opposition to his own vendetta) the fact that she actually looks like Nex often causes people to draw comparisons with how Ninurta does not.
* BewareTheNiceOnes: What happens when [[BreakTheCutie they're pushed too far]]. Mainly applies to Nex, Iffrita and Ninurta.
* BishieSparkle: Yeonoh Yongje
* BroodingBoyGentleGirl: Xix and Yuan. Also [[spoiler:Ninurta and Siana to an extent.]]
* ChekhovsGunman: [[spoiler: Siana]] initially seemed very much a BitCharacter regulated to flashbacks.
* CockFight: Xix and Ninurta engage in one more than one, the first time over Yuan. [[spoiler:Second and nearly every time there after over Siana.]]
* TheCorruption: Apparently the Night Clan can corrupt anything nearby.
* CreepyCute: The Ghost fires/Will o' wisps.
* DarkerAndEdgier: Compared to the previous series Immortal Regis.
* DeliberatelyCuteChild: [[spoiler: During the flashback]] Caladbolg.
* DotingParent: Yeonoh
* EstablishingCharacterMoment: As Nex, the first thing we see Jae Hyuk do is ruthlessly order the purge of a village of suspected rebels men, women, and children alike are all put to the sword. He also chops off the arm of a soldier who questioned his orders. He's not so sweet anymore.
* EtTuBrute: Serin apparently betrayed Nex in the past; the scar on his back came from when she literally back-stabbed him. [[spoiler: Just to twist the knife further, she was also pregnant with one (or more) of his children at the time.]]
** There's a lot of evidence that the betrayal was orchestrated by [[spoiler: Iffrita]], and that Nex has long harbored suspicions about it.
* EvilFormerFriend: Thanks to the backstory this comes a lot for various characters especially with Nex.
** [[spoiler: Iffrita]] given her sweet nature during the flashback can be considered this.
** [[spoiler: Seon Yu from Manhwa/ImmortalRegis]] and Nex both consider each other this.
* FirstEpisodeSpoiler: Somewhat later then the first episode but it's not until Chapter 4 that Nex is confirmed to be Jae Hyuk.
* [BoyMeetsGhoul Girl Meets Ghoul]: Xix and Yuan.
* GreyAndGrayMorality: Between Nex and the forces of Chaos vs Caladbolg and the Night clan
* HeelFaceRevolvingDoor: [[spoiler: Nex]]
* HostileShowTakeover: Poor Xix get not just utterly defeated by Nex, but lost all spotlights to him as well!
** Not really. According to WordOfGod, Nex is still the main character while Xix is supposed to be a SupportingProtagonist.
* HumanShield: Played straight [[spoiler:Ninurta takes his blind companion Lan hostage to avoid capture by Serpent guards. He escapes with her into the main palace where he drops her but encounters the Head of the Serpent clan, Yongje Yeonoh.]] Then subverted [[spoiler:Ninurta is dominated by Yeonoh in the fight and before Yeonoh can finish it he notices if he performs his next attack he will hit Lan who is hiding behind the area where Ninurta is standing and halts his attack, Ninurta not even realizing Lan was behind him, throws out one of his attacks to counter what he thinks is coming, striking Yeonoh in a way he couldn't have done before when Yeonoh had his defenses up.]]
* IncestSubtext: Caladbolg, Nex, Siana, Xix, Miya, Just, Ninurta... to name only a few affected by this. A large problem is due to how this is a story of a really messed up family in-fighting.
* ItsTheOnlyWayToBeSure: Whenever [[KnightTemplar Nex]] finds Night Clan Corruption in a town, he has the inhabitants slaughtered; no exceptions. Somewhat justified as TheCorruption spreads like a wildfire if it's not stamped out in a hurry.
* [[spoiler:KissingCousins: When incest actually did become canon, with Iffrita and Mikhail Noah.]]
* TheLawOfConservationOfDetail: Used a great deal in this series.
** The fact that a undead can't survive without their heart [[spoiler: Xix is captured and later watches his own heart destroyed early in the series at chapter 10, leading to what should have been Skoll being let lose and his death. Instead he turns up fine seemingly with his heart intact. It isn't until dozens of chapters later in chapter 67 that we found out it is because he had two hearts within him since becoming a Undead. ]]
* LonelyAtTheTop: Nex lives this trope, as the only person he really trusts is Depore. The tragic part of this is that Nex is actually an ''inverse'' of this trope. He never wanted power, much less the position of Regis, but was basically shoehorned into it due to circumstance and the actions of others interfering with his life.
** TheChainsOfCommanding: Hence his bitterness.
* LoveAtFirstSight: [[spoiler: Just ''claims'' this as the reason he's hiding Siana with some creepy undertones as well.]]
* LukeIAmYourFather: Xix and Nex are related by blood somehow, and there is a lot of evidence to suggest that Xix is actually the long lost child of Jae Hyuk and Serin. [[spoiler: Though this might be a RedHerring, as Siana, who is totally confirmed as Serin's daughter and has the necromancy to prove it, resurrecting Xix and him taking her heart.]] Neither Xix or Nex are particularly happy about this.
* MorphWeapon: [[AppliedPhlebotinum Ghost Fire/Will o' wisps]] when used by the Night Clan
** Diffor still counts but Nex rarely has need to use her in such a way anymore.
* NotAsYouKnowThem: Nex takes this UpToEleven, going from sweet and driven but arguably naive young teen hero to an evil, sadistic, jaded anti-hero.
** Most major characters from the previous series have made appearances here, more or less along the same lines, but [[spoiler: Seon]] has flipped allegiances to Caladbolg following another one of Nex's (apparently many) massacres.
** Iffrita is notable as well: although she never appeared in the previous work, an extended flashback from two years after ''Immortal Regis'' shows how she wasn't always an utter manipulative bitch.
* TheNoseKnows: The Kirin Clan, Seon Yu's clan, can identify blood by smell.
* PapaWolf:
--> '''Nex''': Don't touch my daughter.
* RivalsTeamUp: Xix and [[spoiler: Just]]
* RivalTurnedEvil: Iffrita and Serin were once friendly rivals for Jae Hyuk's affection, and she even declared that he should "follow his heart" and supported Serin at one point, ''against'' her father's (and surprisingly, [[spoiler:Serin's father's]]) wishes. Today? She hates the Demon clan, and especially Serin, with a passion, and it's implied she had a heavy hand in getting Serin imprisoned.
* SadisticChoice: For Jae Hyuk: To save Serin, or protect the anchor [[spoiler:supporting all of the Abyss]].
** Oski later gives Xix one: [[spoiler: His own life in exchange for a dying Yuan's, or personally accomplishing his revenge against Nex. Yuan interrupts Xix's accepting of the former by making the deal herself.]]
* ShipperOnDeck: Just about everyone from Miya to a dragon goddess ships Xix and Yuan.
* StarCrossedLovers: Nex and Serin. Their relationship is... complicated.
* SupportingHarem: Complete with incest subtext! All the ladies love Nex but he loves Serin most of all, and Xix has a minor harem too but is clearly being set up with Yuan.
* ThatManIsDead:
--> '''Diffor''': Jae Hyuk...
--> '''Nex''': Diffor. You know I threw that name away a long time ago.
** In the same vein, This is Nex's attitude towards Caladbolg. His brother is dead, and that... ''Thing'' is just an imitation.
* TriangRelations: So many! The main one being between Xix, Yuan, and Siana. [[spoiler:Especially as Xix still is not over his [[ChildhoodFriendRomance childhood friend]] despite her reappearance as ForgottenFriendNewFoe.]] Inverse of FirstGirlWins. Xix also is envious of the brief relationship Ninurta and Yuan had. Siana also seems to have the beginning of a FireAndIceLoveTriangle involving Ninurta and Xix.
* UsedToBeASweetKid: Nex, A.K.A. Jae-Hyuk as shown in Manhwa/ImmortalRegis.
* VillainousFriendship The series has quite a few great example, but in particular the friendship between [[spoiler:Caladbolg, Siana and Ninurta]] is notable.
* WeUsedToBeFriends: Seon Yu to Owen and Nex. [[spoiler: He joined the Night Clan because the quarantined his home and led to the point that his entire race was wiped out. Nex does that often.]]
* WhatTheHellHero: Xix calls out [[spoiler:Ninurta]] after the later [[spoiler:attacks the Serpent Clan's capital and seriously wounds Yongje Yeonoh]]. Unsurprisingly given Xix's AntiHero history in the story he gets called out on ProtagonistCenteredMorality by [[spoiler:Ninurta]] immediately afterward.
* {{Yandere}}: The flashback arc reveals Iffrita [[spoiler: set Serin up to get Nex to herself.]] Caladbolg is also an excellent example, [[spoiler:with how he is obsessed with his brother, to the point of wanting to remove Serin, and how he also happily tries to turn Siana's childhood bully into an abomination.]]
* Yonkoma: As a PrintBonus at the end of some chapters, usually has a lot of LampshadeHanging.
* YoungerThanTheyLook: Owen is technically in Nex's age group but doesn't look it.
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