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Fanfic / Chaldea in Remnant

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Chaldea in Remnant is a Crossover Fanfic between Fate/Grand Order and RWBY written by SkyRig, formerly called Starlight's Poet and Demons Anarchy of Pride and of Code Geass: Lelouch of the Rebellion R-eset fame.

Set in an Alternate Universe, following the events of Cosmos in the Lostbelt, Ritsuka Fujimaru and his sister Gudako prepare for a return to a semi-normal life. Their day in Chaldea goes about like any other, with Nobunaga challenging fellow Archers Robin Hood and Billy the Kidd to a shooting match, Osakabe-hime discussing Ritsuka and Gudako's birthday with Kadoc and Anastasia, and Ophelia bonding with Mash.


However, Da Vinci comes to Ritsuka asking for his participating in a new experiment: an artificial recreation of the Second Magic — Kaleidoscope. The experiment goes awry and Chaldea is transported to a new world. Specifically, a world where the moon lays shattered and humanity combats monsters known as the Creatures of Grimm.

While Chaldea debates of whether or not they should become involved in the affairs of this world while trying to find a way back to their own home world, Ruby Rose travels to Mistral in the hopes of defending Haven Academy from the same people who attacked Beacon so long ago.

On Octobor 18, 2020, SkyRig announced that the story would enter hiatus so that he could plan out the fanfic properly after having admitted that Chaldea in Remnant had been written as he went with only a few key details having been planned ahead of time. On January 5, 2022 SkyRig revealed that the outline and endgame for the story was finished and that the hiatus would extend until Cosmos in the Lostbelt was finished. In addition to this, he revealed his plans to rewrite the story from the ground up so that it would be canon compliant.


Beware of unmarked spoilers for both series

Tropes contained in Chaldea in Remnant include the following:

  • Action Girl: Name any female character who has a weapon that's also a gun in the world of Remnant or any female Servant in Chaldea, and chances are, they fulfill this trope and then some.
  • Action Politician: To a degree. During the Brother Gods' tenure in Vytal, they chose people of interest to become their Champions. Champions would become blessed with greater power than what they would already have, and would be called on to deal with any and all wrongs that occurred in the world that caught the attention of the Gods. Ozma was given the chance to become a Champion, but refused them both on account of not wanting to get involved with the politics of being a warrior employed by the gods.
  • Adaptation Relationship Overhaul: In Volume 7, Ironwood and Robyn Hill had a hostile relationship, with Robyn stealing supplies Ironwood needed to get the Amity Arena in the air and use as a makeshift CCT Tower and Robyn distrusting Ironwood for him keeping secrets and doing very little to offer aid to Mantle. Some time after Chaldea restores Vale's CCT Tower, and not wanting an opportunist like Jacques Schnee on the Council, Ironwood chooses to sponsor Robyn's election campaign.
  • Adaptational Badass:
    • Pyrrha Nikos. She was already a badass Action Girl when she was alive, regarded as the best Huntress-in-training of her year and a candidate to receive the powers of the Fall Maiden. As a Servant, she's a literal One-Man Army unto herself and was able to keep up with three Servants at once (her loss notwithstanding).
    • Mash. During the Singularities, she only had limited access to Galahad's abilities and didn't even know the name of her Noble Phantasm until much later into the story, and during the Lostbelt he abandoned Mash and left her severely weakened to the point where she was forced to use special equipment to make up for the lost power. After Galahad gives her full access to her abilities, however, she's strong enough to send the likes of Darius III flying with one punch and can otherwise use abilities she never had before, such as summoning Galahad's sword in the event she doesn't have her shield on her person.
  • Adaptational Early Appearance: Robyn Hill does not appear until Episode 5 of Volume 7. In the fanfic, she appears during the story's events of Volume 4, as Ruby is still with Team RNJR and has not yet reunited with any of her teammates from Team RWBY.
  • Adaptational Heroism:
    • Kadoc and Ophelia. In Cosmos in the Lostbelt, both were enemies of Chaldea. Here, they're allies. Kadoc is noteworthy because he, alongside Ritsuka and Gudako, is an active Master.
    • Galahad is a lot less antagonistic and explains that his abandoning Mash was a Secret Test of Character. Now that they proved themselves by stopping the Lostbelts, he gives Mash her full powers back.
  • Adapted Out: As stated here per Word of God, Pepe will not be featured in the rewritten version of Chaldea in Remnant.
  • All Girls Want Bad Boys: Inverted. If Da Vinci's words are to be taken at face-value, Gudako has both Jeanne Alter (referred to as Joan to differentiate herself from Ruler Jeanne) and the Count of Monte Cristo after her affections.
  • Alternate Self: Aside from the Servants whose legend is founded in history, Chaldea also hosts those same servants from the alternate timelines of the Singularities or the Lostbelts, including the likes of Artoria Alter or the Lion King of the Camelot Singularity. Ozma considers himself as this to his present-day self "Ozma," comparing his circumstance to that of Alexander, the younger incarnation of Iskander; he has Ozpin's memories and is aware of the current state of things on Remnant, but he has not experienced the events that shaped his future self.
  • Alternate Universe: Stated in the author's note to be this, since its set sometime after the events of Cosmos in the Lostbelt while, at the time of this writing, Chaldea has only dealt with four of the seven Lostbelts. Furthermore, Kadoc and Ophelia are part of Chaldea, with the latter being Spared by the Adaptation instead of dying at the conclusion of the second Lostbelt.
  • Armor-Piercing Question: When Blake refuses to try and contact Yang on account of her personal feelings and fears since the Fall of Beacon, Ruby asks her a question that she has no answer to:
    " running away going to solve all of your problems?"
  • Back from the Dead: In a technical sense, given the nature of Servants.
    • Ozma, the original incarnation of Ozpin. While Ozma is still technically alive, now in the form of his new reincarnation Oscar, this is him at his prime before his death and before Salem's Despair Event Horizon and subsequent actions in bringing about the extinction of the first iteration of humanity, summoned a Ruler-class Servant.
    • Pyrrha Nikos. She died at the climax of Volume 3, having been pierced through the heart by Cinder and reduced to ashes. She is revived as a Lancer-class Servant after Chaldea arrives in Remnant and discovers her tiara.
    • Solomon. On top of already being dead historically, he took it up to eleven by returning the gifts God gave to him, and therefore erasing his own legend. This should have erased him from the Throne of Heroes, however because Chaldea obtained one of the Ten Rings of Solomon – a physical representation of the gifts God gave to Solomon – they were able to summon him because it served as proof that a Heroic Spirit called Solomon existed as far as the Throne of Heroes was concerned.
  • Badass Normal: When compared to the rest of the Servants in Chaldea who are either mythological heroes, historical heroes who Took a Level in Badass thanks to their legend, gods inhabiting the body of humans and actual demigods, as well as fellow Remnant Servant Ozma, Pyrrha is Remnant's answer to Billy the Kid. While she was hailed as the Invincible Girl since she never once lost a match, she never accomplished anything truly noteworthy enough that would make her ascend to the Throne of Heroes aside from perhaps her death at Cinder's hands and the people of Argus, her hometown, believing she went down like the hero they thought she was. Even her skillset and weaponry reflect this. Aside from her Semblance, all she has going for her is increased endurance, speed, and strength, and an ordinary weapon that can change forms.
  • Berserk Button: The CCT Tower's functionality is this to Nikola Tesla and Thomas Edison, both of them calling it a disgrace to technology itself. The CCT acting as a major server for the worldwide network isn't what they have a problem with, it's the towers' dependency on each other – if one tower goes down, the entire network goes down with it. When they restore Vale's CCT Tower, they explicitly make sure to remove this weakness.
  • Blood Knight: A Running Gag with the Irish heroes. Pyrrha herself is also one as noted by Solomon since, in contrast to her days as a Huntress-in-training where she had little in the way of competition, Chaldea is host to countless people who can easily mop the floor with her. She loves every second of it since it doesn't make her feel like the so-called "Invincible Girl".
  • Character Development: Yang's development starts much earlier, thanks to the For Want of a Nail entry below. On top of realizing that she's projecting her abandonment issues onto Blake, she also realizes after talk with Weiss that, even after spending two to three semesters with Team RWBY, she never got to know them beyond just them being teammates. All she knew about Blake and Weiss was that one was a former terrorist and the other is an heiress with a troubled childhood and nothing more.
  • Curb-Stomp Battle:
    • Pyrrha battled Romulus, Nero, and Leonidas in a three-on-one spar to test to see how powerful she was as a Servant. Though the rest of the battle is shown off-screen, it's stated that Pyrrha was utterly defeated. That said, she's far from depressed on account of her reputation as the Invincible Girl being jack-shit when surrounded by people who are clearly far stronger than her by a wide margin.
    • In Chapter 6, Ozma decides to test his powers as a Servant in his first real battle on Remnant against Tyrian. Not only does Ozma utterly trounce Salem's enforcer with ease, but Tyrian was never even able to land so much as a single hit.
  • Dark Is Not Evil: Chaldea is host to all sorts of Servants from less than savory backgrounds, but each and every one of them has fought for the sake of their Masters. This includes the likes of EMIYA Alter, the Evil Counterpart to everyone's favorite red bowman, who actually fulfilled his obligations as a Counter Guardian with no questions asked, and Berserker Cu Chulainn.
  • Did You Just Flip Off Cthulhu?: Not in the traditional sense, but Ozma was offered the chance to become a Champion for the Brother Gods – a position held by few very people in Vytal. In the God of Darkness' case, he offered Ozma more power and access to magic that he hadn't even given the people of Vytal when he and his brother first created them. Ozma politely refused both of them, not wanting to get involved in any sort of political obligations the positions might have. The God of Darkness wasn't too happy, but he let Ozma live because he had thus met a human who didn't want the favor of the gods to help people. When Ozma tells this story to Caster Gilgamesh, Gil is impressed since he dislikes gods.
  • The Drifter: After repelling a corrupt lord's attack on his home and realizing the tyranny of these corrupt nobles, Ozma chose to wander around Vytal, defeating corrupt lords across the world. His actions eventually caught the attention of the Brother Gods, both offering him a chance to become their respective champion. He politely refused, on account of the politics that would have come with the job.
  • Entertainingly Wrong: The Roman and Greek Servants, upon meeting Pyrrha, believe she's the Remnant version of a Spartan, with both Nero and Romulus becoming thrilled by the idea that Mistral could be the Rome or Greece of Remnant. Sadly for them, Mistral is modeled after Eastern cultures.
  • Evil Counterpart: The "evil" part may be stretching it, since he helped Chaldea survive the Singularity and Lostbelt incidents, but EMIYA Alter's beginnings in Chaldea were anything but pleasant compared to his better self. Not only had he insulted EMIYA barely after being summoned, but when Gudako tried to get him to open up, he raised his gun at her. The second he did, the entire Emiya Family defended Gudako and was in the position to kill him then and there. Kiritsugu notes that the only reason EMIYA Alter is still with Chaldea is because Gudako is an All-Loving Hero.
  • Experienced Protagonist:
    • On the Fate side of things, you have Gudako and Ritsuka. Both have dealt with Demon King Goetia and the other Demon Pillars and their plan to incinerate human history itself, and more recently, dealt with the Lostbelt crisis instigated by the Alien God and the Crypters. If they do decide to get themselves involved in the affairs of Remnant, an immortal witch is hardly the most challenging thing they'll have faced.
    • For Team RWBY, while they're all still technically Huntresses-in-Training, this is them following the events of Volume 3. Unfortunately, Yang is currently a Shell-Shocked Veteran, as she's still recovering from the loss of her arm to Adam.
  • Expository Hairstyle Change: In Intermission 1, wanting to move on from her bitter self and to show off the major turning point of her character arc, Yang decides to cut her hair short.
  • Forgiven, but Not Forgotten: Averted hard. While thinking to herself about the recent developments revolving around the CCT tower's reconstruction, Salem reveals to have forgiven Ozma for being "misguided" and following the will of the Brother Gods. The one thing she will never forgive him for, however, is murdering their children when they were caught in the crossfire of their battle.
  • Fix Fic: For the Cosmos in the Lostbelt arc in general, as this fic features every morally-white Crypter alive and well. There's also the fact that Dr. Roman is back, even though the lore of Grand Order states any such thing isn't possible.
  • For Want of a Nail:
    • Chaldea's visit to Vale hosts several nails all on its own. Not only is the CCT Tower repaired and its communication system improved to the point where it no longer is dependent on the other towers, but they also removed the petrified Grimm Dragon from Vale and took it back to their base for study, thus preventing more Grimmm from being attracted to Vale and allowing Glynda to proceed with restoration efforts. The results of the CCT's repair are 1) Glynda getting into contact with Ironwood and Leonardo, and the former two noticing Leonardo's odd behavior, 2) Ruby contacting the currently-scattered Team RWBY, and 3) Ironwood not needing to impose a Dust embargo.
    • During their journey on Anima in order to reunite Pyrrha with Jaune and the rest of Team RNJR, Ritsuka and co. encounter Tyrian who is on the hunt for Ruby as per Salem's orders. They defeat him before he can encounter his targets as he did in canon, and the fight was also recorded and posted all over the net as Ruby and Jaune discover the video showcasing Ozma's Curb-Stomp Battle with him and letting them know that their friend is now Back from the Dead.
  • Future Me Scares Me: Played with. When he's summoned by Chaldea as a Ruler-class Servant, Ozma manages to retain the memories of his present-day self Ozpin and pities what he has become, hoping that "the poor old man" can find peace.
  • Good Old Fisticuffs: At some point during their spar, Romulus forgoes using his spear and attacks Pyrrha with his bare fists.
  • Groin Attack: Delivered on two occasions.
    • Gudako promised to herself that, if she ever saw Romani again, she would kick him in the balls. She follows up on that promise when he's summoned by Chaldea after having obtained one of his rings from the Alien Priestess. Later on, Romani fears for his groin when Nightingale attempts to treat taking a bonesaw to his genitals.
    • Pyrrha accidentally inflicts one to Leonidas during their spar. She apologies to him profusely, but Leonidas waves her off, saying it's not the first time he's been hit there.
  • Harmful Healing: Make no mistake, Nightingale is a wonderful doctor and apparently mans Chaldea's medical ward by her little lonesome. The problem? She sometimes tends to go overboard in her treatments. When Gudako delivered a Groin Attack to Solomon's family jewels, Nightingale's solution was to take a bonesaw to his bruised genitals.
    Leonidas to Pyrrha: You haven't seen her in full-on doctor mode. Most Berserkers are so nutty that all they care about is killing the enemy. Her? She's a different kind of crazy. If somebody's injured, she'll heal 'em in any way she can, even if it kills them.
  • Heel–Face Turn: Kadoc and Ophelia, who joined Chaldea sometime during the events of this story's version of events in Cosmos in the Lostbelt.
  • Loophole Abuse: By law, no one on the Atlas Council can interfere, impede, or sabotage someone who is campaigning for a seat on the Council. However, that does not mean Council Members can't get involved in some way. Ironwood exploits this loophole by sponsoring Robyn Hill's campaign.
  • Lovable Sex Maniac: Medb, but then did you really expect anything less? She apparently engages in sexual activities almost everywhere in Chaldea. It's gotten to the point that, when people see her, they've become so accustomed to it that they take it in stride. When Gudako takes Solomon to the medical ward, Medb had just got done having sex with Fergus.
  • My God, What Have I Done?: Zigzagged, then later played straight. When Yang angrily calls Blake out for running away when Ruby calls Team RWBY after the CCT is restored, she later realizes that what she did was uncalled for, but she doesn't actually feel sorry for doing it. After a heartfelt talk with her father and realizing that she had been projecting what Raven had done by abandoning her shortly after her birth onto what Blake did by leaving her with no explanation whatsoever, it finally sinks in that she was horrible towards Blake and later consults Weiss for advice.
  • My Greatest Failure: Though he had no control over the situation, Ozma feels responsible for Salem crossing the Despair Event Horizon that came following his death, as well as his role in bringing about the extinction of the first iteration of mankind.
  • Mysterious Waif: Shortly after Chaldea appears in Remnant, a little girl appears in their headquarters. She has amnesia and the Servants can tell that she is neither a human nor a Servant. When she sees Atalanta, she mistakes her for a Faunus before taking a closer look and realizing Atalanta and the other Servants are neither humans nor Faunus. She can also understand what Fou says. Given that she mistook Atalanta for a Faunus, it's implied she's from or connected to Remnant, but how she can understand Primate Murder at his most adorable is anyone's guess. When she meets Pyrrha, she hugs her and says she is sorry before walking away, confusing everyone. Theoretically speaking she could be some kind of manifestation of the Fall Maiden's powers, and considering that the F\GO side of the crossover's part of the Nasuverse, it isn't that far-fetched.
  • Oh, Crap!: Solomon freaks the fuck out when he realizes a crazed Nightingale is attempting to treat his bruised genitals with a bonesaw and tries to evade her, with no success as he's eventually caught. The next chapter reveals that he did survive the ordeal.
  • One-Steve Limit: Discussed by the versions of Scathach and Cu Chulainn. Chaldea hosts several Alternate Self counterparts to existing Servants, such as Artoria Alter, the Lion King or her Lancer Alter counterpart and take on different names to identify each other, some settling on being addressed by their Class. Ozma himself notes just how confusing it is and tells Kadoc he was nearly beheaded by Artoria Alter after confusing her with Artoria Pendragon.
  • Other Me Annoys Me: If you thought EMIYA and Shirou couldn't get along, EMIYA and his Alter counterpart are even worse. Not only can't they stand being in the same room together for long periods of time, someone actually has to be there to keep them from killing each other.
  • Properly Paranoid: Ironwood. You really can't blame the man, considering that he had been fearing the worst, Atlas being portrayed in a negative light thanks to Cinder hacking the Atlesian Knights and Paladins, and up until now communication between the Kingdoms was impossible. The CCT being restored by Chaldea and talking with Glynda is implied to be the first thing that's gone right for him in a very long time.
  • Secret Test of Character: Galahad's reason for limiting Mash's power during the Lostbelt incidents. Rather than being angry at Chaldea for unknowingly giving the Alien God a chance to attack, he did so to see if Mash, and by extension the Fujimaru siblings, would be able to withstand the trials of the Lostbelts and if they would be able to prevail over what would come after the Lostbelt incident was resolved.
  • Shout-Out: The title of the first Intermission chapter is "Burn My Dread".
  • Slice of Life: The majority of the opening chapter had this element, not too different from the premise of Fragments of Chaldea, as Joan and Jeanne are playing with the children Servants, Nobunaga is having a shooting contest with Billy and Robin, and Osakabehime discusses Ritsuka's birthday with Anastasia and Kadoc.
  • Spared by the Adaptation: Ophelia died in the events of the video game, due to overusing her Mystic Eye in order to sever her ties to Surtr. Here, she survived thanks to EMIYA and Medea both using Rule Breaker to sever the connection – possibly to either Surtr or her Mystic Eye.
  • Star-Crossed Lovers:
    • Pyrrha still has feelings for Jaune, but is afraid to try to contact him, believing it could never work. She is already dead and her existence is tied to Chaldea. When Chaldea returns to its world, she'll either disappear or go with them. Everyone in Chaldea, including Ozma, encourages her to at least see him again, then Ritsuka decides to send a team to help Team RNJR.
    • Tying with Pyrrha's own situation, Ozma himself notes he still loves Salem dearly, but knows full-well from the memories of Ozpin that there is no chance of them rekindling that love.
  • Wham Line: At the end of Chapter 4, after Yang asks Weiss for advice as to how she can mend her relationship with Blake and makes a phone call.
    Yang: Hi. Is this Kali Belladonna?
  • Wham Shot: The end of Chapter 7, which has Pepe summon a new Servant. It's Roman Torchwick, who is now a Pseudo-Servant and is being possessed by Arsène Lupin.
  • What the Hell, Hero?: Played for Laughs. Though not actually said, Da Vinci and Gudako were pissed at Romani for sacrificing himself and punish ruthlessly him for it. For Gudako, she fulfills her promise of kicking him in the balls next time she saw him and Da Vinci leaves him at the mercy of Nightingale, whose Mad Enhancement makes her determined to heal her patients even if it kills them.
  • You Have GOT to Be Kidding Me!: This is Glynda's reaction upon seeing who Ozpin's new reincarnation is.
    Glynda: You have got to be kidding me.
    Oscar Pine: Please don't kill me.