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"This is going to be a very different war."
Saber
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Fate Genesis is a Fate/stay night and Sonic the Hedgehog crossover by Cybertoy00.

While on a routine foiling of Dr. Eggman's latest bid for world domination, Eggman's superweapon malfunctions, sending the Sonic crew to the Nasuverse- specifically, Fuyuki, at the beginning of the Fifth Holy Grail War. Sonic and Tails get wrapped up with Shirou's group, Knuckles falls under Caster's influence, and Amy Rose finds Bazett Fraga McRemitz.

But the Chaos Emeralds have also arrived in Fuyuki, setting off a new race for power. And Dr. Eggman is still up to his old tricks. What kind of outcome awaits, now that the Holy War has been set on a new route?

Not to be confused with the Fate/Genesis Roleplay


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This work provides examples of:

  • Accidental Truth: When Issei comes across him and Illya, Shirou tells him that she's a relative of Kiritsugu, even mentally applauding himself for coming up with such a clever fib on the spur of the moment. When Issei asks why she doesn't look Japanese, he mentions how Kiritsugu often went abroad as a defense and is startled when Taiga says Kiritsugu was married once.
  • Actually Pretty Funny: Kirei has to admit, despite the situation with Sonic causing him stress to try and cover up, watching a deafened Lancer stumble around the church yelling "WHAT" after being hit with a Sonic Boom is kinda funny.
  • Advancing Boss of Doom: Sonic's skirmish with Berserker is mostly a matter of staying out of The Juggernaut's reach.
  • Affectionate Gesture to the Head: Cubot and Orbot do this to Shinji when he provides Eggman with critical info. He basks in the praise for a second before shooing them off.
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  • All Myths Are True: Eggman realizes this is the case in the Nasuverse when he learns that Berserker is Hercules, who is apparently only a myth in his world.
  • All Your Powers Combined: Avenger, due to being created from the Shadow which was in turn made from the sludge of the Fourth War's Grail, hints that he possesses the powers of all the fallen Servants of said War save Saber (since she died after destroying the Grail) and Gilgamesh. He proves this by using Assassin's Presence Concealment, summoning Caster's monsters, and manifesting Diarmuid's two lances with all their effects.
  • Amplifier Artifact: The Chaos Emeralds provide so much raw energy that just one is sufficient to provide enough energy to not only anchor a Servant into the world, but give them enough power to fight at near full-strength even without a Master. Caster uses the Chaos Emerald she grabs to boost her magecraft to the point where she can supply energy to herself, Assassin, Saber and Archer at once, while still holding Taiga under a spell that renders her Brainwashed and Crazy, with Illya, who is easily more powerful than most modern mages, being unable to stop it, forcing Shirou to project Rule Breaker to break the spell. Archer, after feeling the energy she's providing him (even more than Rin could), realizes that she'd be unstoppable with the whole set. However, even Caster has to build a grid in order to siphon off the energy without accidentally overloading herself.
    • They have so much energy that they can overwhelm the unprepared mage, Shirou inadvertently tapping into the energy of the yellow Emerald while demonstrating magecraft to Sonic would have killed him without Avalon, and Rin's superior Prana senses nearly cause her to go into cardiac arrest just from briefly touching it, with something similar almost happening to Illya.
    • Earlier, Rin figures out a way to use Power Rings to boost her Magecraft in addition to their usual protective abilities. Servants can also absorb the rings to replenish their energy, which Saber takes full advantage of and Assassin is able to use to leave the Temple for brief periods and even fight Archer.
  • Anti-Magic:
    • Rin is able to use Rings to create talismans that disrupt magecraft.
    • Shirou finds Kiritsugu's Thompson Contender and Origin Bullets, which react violently when their target uses magecraft and destroys their ability to use it. When he shoots Caster with one, while it doesn't kill her, the contradiction of a Servant (a being created from magecraft) being struck by a weapon meant to end magecraft's usage all but cripples her and destroys the various strengthening runes she placed on Souichirou.
  • Arbitrary Skepticism: Rin and Archer are more skeptical of Sonic and Tails' claims than Shirou and Saber are, despite being a Mage and Servant, at least at first.
  • Awesome, but Impractical: Rin mentions a Tohsaka magical device that allows communication between two points, regardless of distance or electricity. Shirou then asks the obvious question, "what if you want to call someone else?".
  • Banana Peel: Sonic uses this to trip up Berserker after the giant starts chasing him.
  • Batman Gambit: Caster tries to make Saber and Shirou look like the villains to Knuckles by having them attack her when he was nearby. It fails, but she still manages to Rule Breaker Saber.
    • Avenger wants a second Emerald, but Sakura can’t handle the energy of two. So he shows Zouken the one he has to get him actively searching so he can get energy from his Emerald when he finds it.
  • Bee Afraid: What Sonic throwing a wasp nest at Lancer plus his instinctive swing at it due to Protection from Arrows equals.
  • Big Brother Is Watching You: Lancer notices someone planting a listening device on the church during reconstruction after a robot attacked it, and purposefully leaves Kirei in the dark about it.
  • Big Damn Heroes: Illya and Berserker show up just in time to save Shirou from Caster after she steals Saber.
  • Bigger on the Inside: Zelretch's Treasure Chest (still in Rin's care) and its occupant are mentioned.
  • Big "WHAT?!": Lancer keeps letting these out after being deafened by Sonic hitting him with a supersonic shockwave.
  • Blackmail: Sonic manages to take a picture of Kirei and Lancer together, and says that unless they let him go, he'll send it and make sure everyone realizes Kirei is working with a serial killer (getting around The Masquerade on the War since there's no evidence of magic in the pic). Kirei is forced to do so after Lancer doesn't attack Sonic on the rationale that the Hedgehog's speed might allow him to send it before they could stop him.
  • Blah Blah Blah: When Tails tries to explain how the Power Ring synthesizer works, all Rin hears is "Blah Blah Blah" interspersed with words like "Techno Babble" or "Jargon" (and insults she almost certainly made up in her head).
  • "Blind Idiot" Translation: Cubot does one of one of Zouken's grimoires, due to a cheap Internet-downloaded translator.
  • Born Lucky: The narration comments that, if Sonic were summoned as a proper Servant, his luck rank would be A+, as him causing Berserker to slip on a Banana Peel and fall a couple of stories onto a car demonstrates.
  • Both Sides Have a Point: While arguing with Sonic over his repeated public appearances, Rin is forced to concede that Sonic's isn't wrong for wanting to save lives. However, she knows what steps the Mages Association will take if The Masquerade is weakened enough. (See below)
  • Brain Bleach: Shinji has Cubot spy on Sakura's "training session" in order to start understanding magecraft. Cubot and Orbot end up erasing their memories of the experience they're so squicked out, but Shinji (Who in canon took certain liberties with his step-sister) isn't so lucky.
  • Brainwashed and Crazy: Caster put a failsafe on Issei in case anyone tried to hypnotize him and check him for Command Seals, causing him to attack Shirou and Illya. She does the same to Taiga, but the Chaos Emerald means Illya can't break her control.
  • Broken Masquerade: The government had been looking into things when the events of the Fourth War that made it past The Masquerade started happening again as the Fifth started up, but were getting nowhere, save IDing Saber as the same lady. But then Eggman, Sonic, Tails, Amy and Knuckles showed up, the former two even fighting in the middle of the day on live TV, along with a Saber wearing a Kamen Rider helmet to disguise herself, giving them solid leads and scavenged Egg-tech to track down the magecraft of the city with. As Lancer mentally lampshades when he finds a bug being planted in the church after Eggman attacked it and realizes that some individual figured out that worth keeping under surveillance, it's a kind of Pandora's box situation, with the veil of secrecy that worked before gone now. Before, public officials could just be hypnotized into giving mundane explanations like hallucinations or accidents to events, and while that would still leave at least one person unconvinced, they'd be left with no proof or evidence of any kind. But the blatant nature of Sonic and Eggman means that they're impossible to cover up, even if there was a modern magi strong enough to give Laser-Guided Amnesia to the entire city, which isn't possible, the news feeds are all over the internet and impossible to get rid of (not to mention security feeds that magi forget to erase). Now, people are questioning their entire worldview, and want real answers, not the same old excuses. Kirei is essentially running ragged trying to plug holes in a fracturing dam with his finger, and the Clock Tower is only just being held back from glassing the city in a desperate attempt to bury the evidence by the fact doing so to a large city like Fuyuki could risk a war between Britain and Japan, which would do the magi no favors whatsoever.
  • Bruiser with a Soft Center: Berserker is as much as rage and violence incarnate as he was in canon, but when Illya is knocked out by a stray rock, the giant, instead of going even more crazy, just cradles his Master very delicately in his arms and takes her home. Sonic even calls him as such after the fact.
  • Bullying a Dragon: Shinji enjoys his The Dog Bites Back moment so much that he even goes as far as to push Zouken out of his way. Keep in mind that Zouken is a powerful mage and Shinji...isn't. Following that, Zouken makes it clear in his thoughts that his first order of business upon attaining immortality is to torture Shinji for the rest of his natural life, and that the only reason he hadn't started the moment Shinji did that was out of shock at the sudden change.
  • But for Me, It Was Tuesday: Sonic, Tails, Knuckles and Amy have so many crazy adventures on a regular basis, up to and including being transported to other worlds, that ending up in the middle of the Grail War doesn't faze them that much. Dr. Eggman is a similar case, his reaction when Orbot figures out that they've transported to the Nasuverse is a complaint that other worlds never have anything familiar on TV.
  • Butt-Monkey:
  • Call-Forward: Sorta. Rin has a vision of Illya being adopted by Shirou, which happened in the canon Fate route, from Archer's memories.
  • Cannibalism Superpower: Avenger implies that he is able to consume the Servants of the Fifth War to gain their powers like he gained the powers of the ones from the previous War, and expresses a desire to do so to Saber and Archer, the only ones he's missing. Rider gets an unfortunate first-hand experience to it, but is killed by Bazett before she's fully assimilated.
  • Canon Immigrant: It's stated that the "Mr. Stuart" who appears in this story isn't the same Stuart from Sonic X- rather, it's a Nasuverse version of Stuart.
  • Clarke's Third Law: As he explains to Shinji, Eggman doesn't believe in magic, per se, only phenomenon attributed paranormal characteristics due to being poorly understood. Ironically, Nasuverse magecraft does operate under something similar, as magecraft cannot perform feats that would be impossible otherwise through other means (i.e. if technology can't do something yet, like say build a Time Machine, magecraft can't do it yet either).
    • True Magic draws from the Root, and is thus an exception to this, hence why the few remaining Magicians, like Zeltretch, are so powerful. Caster Class Servants are so much more powerful than modern mages despite coming from a time when technology was more limited because back then, True Magic and regular magecraft were less distinct, and there were more paths to the Root.
  • Call-Back: Mostly done by the Sonic characters, who bring up various adventures they've gone on.
  • Celebrity Paradox: Almost. In an early chapter, Sonic finds a Sega Genesis and plays Altered Beast on it. He notes that he hasn't seen one of them in years. In either Sonic's world or the fate/stay world, who was Sega using as a mascot in the absence of Sonic? Alex Kidd still?
    • It's noted in a later chapter that at least the original Sonic game was created after Sonic saved the world from Eggman the first time. Apparently "Everybody wanted a piece of Sonic"— Tails notes he has a lunchbox and thermos with Sonic's image in his workshop.
  • Cover-Blowing Superpower: When Eggman attacks the school, Saber attempts to lure him away, but he doesn't take the bait, and with so many people watching she is unable to use Excalibur, even without activating the Sword Beam. Luckily Sonic shows up, but that just causes more problems.
  • Crippling Overspecialization: Mages, being Hopeless with Tech and dismissive of it besides, tend to focus on defending against other mages and other supernatural threats, allowing Eggman's robots to just waltz right through Bounded Fields with no apparent issue.
  • Curb-Stomp Battle: Gilgamesh vs Davy Sprocket; Gil demolishes the robot and a portion of the church, much to Kirei's unhappiness.
  • Decapitation Presentation: Gilgamesh does this with Sella and Leysritt's heads when he shows up to the mountain.
  • Didn't See That Coming:
    • Assassin having more than token involvement in the War outside the Temple completely throws Archer for a loop.
    • Gilgamesh making such an early move after Caster's defeat was something Archer wasn't expecting and notes couldn't have come at a worse time.
  • Didn't Think This Through: Shinji shortsightedly tells Eggman about the War, which is lampshaded in and out of story as idiotic and a mistake. According to Taiga, he gets his greediness and shortsightedness from Zouken, whom she met at a parent-teacher conference.
  • The Dog Bites Back: Lancer, after his humiliating defeats, deliberately doesn't tell his "Master" about a listening device installed in the church by government agents after an Eggman robot demolishes it. After Sonic gets a picture of them together to use as Blackmail to force the priest to let him go, he deliberately ignores Kirei's order to attack, using the excuse that Sonic might be fast enough to send the picture before he could take him out.
  • Empowered Badass Normal: Souichirou, thanks to being an assassin further empowered by Caster's strengthening runes. They serve him well fighting Knuckles, but when the runes are forcibly dispelled thanks to Caster being shot by an Origin Bullet, Souichirou ends up injuring himself striking Knuckles and allows the echidna the chance to knock him out.
  • Everyone Has Standards:
    • Apparently, any non-Zouken mage would be disturbed by what Kirei did to the fire orphans (at least, in Kirei's own opinion).
    • Shinji may be a Jerkass to the nth degree, but even he is disturbed to the point of throwing up when he sees a recording of what Sakura's "training" under Zouken entails. Orbot and Cubot have a similar reaction, with more pity for Sakura, before erasing their memories of the experience because they're that grossed out.
  • Explaining Your Powers to the Enemy: Caster does this about Rule Breaker after stealing Saber, as she's completely confident a third-rate magus like Shirou can't do a thing to stop or harm her as she is, allowing Shirou to Project it and free Taiga later, and eventually, it allows him to sever her contract with Saber and take her back.
  • Failed a Spot Check: Gilgamesh completely fails to see the signs of Eggman's robots having marched en-masse into the very tunnel he's entering into Caster's territory, mainly due to the fact he deems it both beneath his notice and he's far too occupied with far more "interesting" things such as Saber and the Chaos Emeralds.
  • Failsafe Failure: Lancer's Protection From Arrows skill allows him to instinctively dodge or deflect projectiles, but, as it turns out to Lancer's dismay when he learns this, that Protection From Arrows does not take into account whether the incoming projectile is a wasp nest full of wasps or not.
  • Fake Defector: When Caster offers Archer a We Can Rule Together speech, he decides to allow her to Rule Breaker him, but doesn't seem to be on her side, as per Unlimited Blade Works.
  • False Flag Operation: Stuart's group creates a fake Eggman robot to observe the players of the War.
  • Flat-Earth Atheist: As noted in Clarke's Third Law, Eggman takes a very Tony Stark-ish viewpoint to magic, considering it scientifically explainable phenomena that just hasn't been examined to that point yet.
  • Fourth-Wall Mail Slot: The Tiger Dojo acts as one, answering questions from reviewers.
  • Fridge Logic: In-Universe, Both Sonic and Rin question some of Eggman's design choices in his installations, like installing pitfalls and loop-de-loops. Sonic wonders if him getting overambitious and running out of materials partway through is a component.
  • From Bad to Worse:
    • Chapter 11 ends with Caster using Rule Breaker on Saber and grabbing the Chaos Emerald Shirou found.
    • The next chapter has Caster, after fleeing with Saber and Knuckles, then gain Archer's Command Seals, and send a brainwashed Taiga to attack Shirou and Illya.
  • Gilligan Cut: When Tails tells Rin that he's fixed the Tornado, she rejects his invitation to come along on the test flight. The next paragraph has her mentally cursing the Puppy-Dog Eyes of a Furry Fox while seated in the plane's second seat.
  • Geometric Magic: Lancer uses his runic magic to trap Sonic in a Bounded Field during the day.
  • Goggles Do Something Unusual: Tail's goggles can, among other things, see Assassin when he's under Presence Concealment.
  • Go-Karting with Bowser: In an attempt to form an alliance or at least form a ceasefire, Shirou treats Illya to a movie, even though she was still an enemy by that point. This leads to her becoming The Thing That Would Not Leave for the night, and a big surprise when the rest of the heroes discover the little girl who tried to kill them playing Genesis games with Saber.
  • Good Thing You Can Heal: Said by Sonic to Shirou after the overload moment in the first chapter. Saber notes that Avalon's power has been doubled somehow.
  • Gory Discretion Shot: The narration cuts away when Gilgamesh prepares to kill Sella, Leysritt, Caster and Soichirou in Chapter 17. We only see the aftermath of the former two when he drops their heads before the heroes, and the Tiger Dojo at the end of the chapter shows Medea popping in with Irisviel saying in no uncertain terms Soichirou died with her.
  • Grew a Spine / Not Afraid of You Anymore: Teaming up with Eggman gives Shinji the impetus to openly defy and denounce Zouken.
  • Had To Be Sharp: Eggman, as Shirou lampshades, had to keep updating his technology to keep up with Sonic and friends.
  • Hammerspace: Amy, as usual, startling Bazett.
  • Hero Worship: Shirou, in a subdued way, does this towards Sonic, both for the fact he's legitimately a hero and how Sonic gives him advice and encouragement to pursue his dream of a Hero of Justice instead of berating him for it like everyone else he ever met. Archer compares it to a kid realizing Santa Claus is real and notes deep down he's actually a little jealous since he never had that kind of encouragement growing up.
  • Hoist by His Own Petard: Kirei gives Rin a cell phone as Troll gift. Rin gives it to Sonic, who takes a picture of Kirei and Lancer together, and uses it to get Kirei to let him leave. The priest is aware of where the phone came from, and is not happy when he realizes this.
    • In chapter 12, Shirou manages to use Rule Breaker, which he knew enough about to try and copy thanks to Caster, to free Taiga from Caster's Chaos Emerald boosted Brainwashed and Crazy. And in Chapter 17, he uses that very same Noble Phantasm on Caster to take back Saber.
  • Holding Back the Phlebotinum: The narrative states that Saber can't use her Noble Phantasm in Fuyuki because doing so would annihilate the city. Luckily, she can still aim it at targets high in the sky, such as Eggman's airship.
  • Hopeless with Tech: Although most magi in the story fit, forgetting about security footage and the like, Rin is the main example. Any time she tries to use tech, she has trouble with it.
  • I Just Want to Be Special: Eggman uses Shinji's desire to be special to manipulate him to his side.
  • Immune to Bullets: Servants are immune to conventional weaponry like bullets due to being composed of Prana, and thus they need to specially designed for such combat (Eggman and Tails have built energy weapons that fit the bill due to utilizing Chaos energy, which can interact with Servants). Caster makes the mistake of letting Shirou shoot her with one of Kiritsugu's Origin Bullets while using Magecraft under this logic, which cripples her badly.
  • Immune to Mind Control: Sonic and his friends are noted to have a high natural Magic Resistance, to the point Rin completely failed to influence Tails. Even Caster, a Witch from the Age of Gods, notes that she only succeeded on Knuckles because he was asleep at the time and his own natural gullibleness, and even then she could only influence, not outright control, him.
  • In the Blood: Taiga notes in a Taiga Dojo conversation that greed and short-sightedness seem to run in the Matou family, noting that Shinji and Zouken seem alike in that regard after meeting the latter for a conference.
  • Inertia Is a Harsh Mistress: Rider attempts to use her Mystic Eyes of Petrification on Sonic when they first fight. The problem is, she takes off her blindfold when Sonic is building up a Spin Dash. Rider is so unprepared for Sonic's momentum that she gets struck dead-on by a spiny ball of stone.
  • It Can Think: Avenger. In the canon Heaven's Feel route, the Shadow was just a barely-sentient beast that attacked people to feed itself. Here, the Shadow has become as manipulative and calculating as anyone to Zouken's frustration, who notes it wasn't supposed to be able to think for itself, much less talk and plan, and blames it on Sonic and company's arrival (which isn't wrong, because it was caused by Shirou's attempt to Project in front of Sonic that went wrong from a surge of Chaos Emerald energy). Including figuring out that stealing a Chaos Emerald will provide him with more Prana than he could get from Fuyuki's population.
  • I Work Alone: Shirou has a habit of doing this, mostly because he feels like he doesn't deserve help after what happened during the Fuyuki Fire. Sonic calls him out on it in Chapter 14, pointing out that even he needs help sometimes, as even he's had, people he couldn't save working alone, and he starts breaking free of it after helping free Sella and Leysritt from being imprisoned upon realizing he can't defeat Eggman's robot Spike by himself and then helping them destroy it.
  • Joker Immunity: Sonic and Tails lampshade how Eggman has a knack for surviving situations he logically shouldn't, giving the climax of Sonic Colors as an example.
  • Killed Off for Real:
    • Being a Holy Grail War, this is bound to happen eventually, and Rider is the first to bite it in Chapter 15 at the hands of Avenger and Bazett. At least she didn't get eaten by Avenger.
    • Chapter 17 has Sella and Leysritt being killed by Gilgamesh, and though it cuts away he kills Caster and Souichirou, as revealed in the Tiger Dojo omake at the end of the chapter.
  • Killed to Uphold the Masquerade: The Mage's Association has done this many times, even wiping out entire cities, and Rin is afraid they'll do the same to Fuyuki if the Grail War is at risk of exposure, and is trying to prevent that, including informing the Clock Tower of Eggman's magecraft detecting technology. Bazett is also doing what she can, and notes that the military presence in the city means that the Clock Tower can't just glass it, or risk starting a war between England and Japan.
  • Know When to Fold 'Em:
    • Caster, even with Saber and a Chaos Emerald, isn't stupid enough to stay in the same place as an angry Berserker.
    • Sonic immediately Chaos Controls everyone on the good guy's team out when confronted by a very angry Gilgamesh.
  • Laser-Guided Amnesia: Orbot and Cubot can do this at will, which they do in order to forget about seeing Sakura's "training" which Cubot had previously recorded (and then deleted his own memories after doing so while writing a note and saving a backup). Shinji, who put Cubot up to it, probably wishes he could do the same.
  • Leave No Witnesses: Or, as Sonic put it in chapter 10, "Thou Shalt Not Get Caught"
  • Let's Get Dangerous!: Lancer eventually gets the go ahead to use his runic magic to catch Sonic in a Bounded Field
  • Let's You and Him Fight: Caster sends information to the Church that allows Lancer to intercept Sonic while the Hedgehog is on his way to Shirou. Lancer suspects that this is a set-up for a grander plan, but still decides to chase after Sonic regardless.
  • Let Us Never Speak of This Again: Sonic was supposed to do this for the time Knuckles got his head stuck in a drain-pipe.
  • Locked Out of the Loop:
    • Eggman is completely unaware of the details about the Servants or Grail War. At least, he is until Shinji tells him about it at the end of chapter nine...
    • Agent Stuart as well. While Sonic's gang appearing has given his investigation more leads and evidence, allowing him to start getting closer to the truth, he still has no idea what exactly the Fate characters are doing.
  • Loophole Abuse:
    • Lancer using his Bounded Field to attack Sonic during the day.
    • Sonic turns it back on them with his Blackmail image of Lancer and his Master together. It's not jeopardizing the War to send a picture of a priest and a serial killer standing together to the media...
  • Mad Scientist: Eggman of course, but on the Fate side of things, it's noted that a lot of mages tend to fall into this too. One of the major reasons for The Masquerade is to allow mages the freedom to do unethical and immoral experiments without opposition.
  • MacGuffin: The Holy Grail and the Chaos Emeralds, of course. Notably, however, several of the villains (notably Zouken and Avenger) have decided to move to grabbing the latter rather than the former thanks to overhearing Knuckles saying all seven can bring forth a miracle.
  • Magic from Technology: Part of the reason why Rin has trouble accepting Sonic and Tails' story about being from another world; She equates the warp that brought them to Fuyuki to an act of the Second True Magic, and can't quite accept that a machine can do it. Later on, she concludes that there's a much shorter gap between Magecraft and technology in Sonic's world. When holding her captive, Eggman even manages to siphon off her prana so she can't just bust out.
  • Magic Is a Monster Magnet: The devices used to track the energy signature of Chaos Emeralds can't differentiate between them and the energy normal magecraft or Servants, causing Eggman to attack wherever multiple Servants are looking for the Emeralds.
  • The Masquerade: Most magi and the pragmatic Dead Apostles in the Nasuverse do their best to maintain their secrecy, often with liberal uses of hypnosis, the former to keep too many people from learning that magic exists, and thus preserve their power by keeping too many people from using their systems of magecraft (as that would split the power to the point of near uselessness) and prevent Clap Your Hands If You Believe from limiting their potential paths for advancement with those systems, as well as make sure they are able to conduct experiments any sane person would consider immoral, and the latter to keep humanity's number advantage from being used against them. The Magic Association doesn't care about atrocities magi commit in the name of research as long as they keep it secret, being perfectly willing to kill off entire towns to preserve that secret if need be, and the mage participants of the Grail War are fully aware that they need to do their best to avoid leaving witnesses or otherwise draw too much attention to themselves to prevent Fuyuki from going that way. The Church also participates in the cover ups, like Kirei in his role administrating for the Grail War, but for more ambiguous reasons.
    • Unfortunately for them, as Lancer notes, Sonic's gang and Eggman appearing means that things have gone to Broken Masquerade already, and almost certainly to The Unmasqued World in the future.
  • The Men in Black: A minor plotline is the investigation of government agents such as Stuart and Twice H. Pieceman trying to figure out what's happening in Fuyuki.
  • Minion with an F in Evil: Assassin, as per canon. He's unbelievably personable and happily shoots the breeze with Sonic and Knuckles, as well as mocking Caster behind her back to their faces. As long as they don't make any moves to enter the Temple he never attempts to fight, and even Knuckles is exempt due to his alliance with Caster.
  • Mistaken for Romance: Knuckles seems to be under the impression that Shirou and Saber are boyfriend and girlfriend (and while they have gone past the Master-Servant relationship to friendship, it's still not romantic, yet anyways), but Shirou doesn't have time to correct him given Caster's attacking with her Dragon Tooth warriors and already stolen Saber with Rule Breaker.
  • Muggles Do It Better:
    • Rin at one point mentally lampshades how technology keeps one-upping magecraft, or at least the close-mindedness of Hopeless with Tech mages. For example, Boundary Fields that fail to detect or even block Eggman's technology because the mages who made them never thought that technology could be a threat to them. Rin also expresses disbelief that Eggman's stronger robots and mechs can fight on a somewhat even ground with Servants rather than being torn apart, but Shirou remembers that Eggman's been fighting Sonic (the guy who's casual running speed breaks the sound barrier) and his other superpowered friends for years and needed to up his game to stay ahead.
    • Illya lampshades this viewpoint when Eggman briefly has her captive, remembering how her father telling her how the biggest flaw among mages tends to be overconfidence in their own abilities/an assumption that their magecraft made them immune things like rifles and time bombs, which is supported by how he managed to assassinate so many mages while only possessing low-level magecraft himself. Her grandfather, on the other hand, believed that all anyone needed to win was raw Thaumaturgical power, strategy becoming redundant with enough force (hence why they summoned Heracles as Berserker), and spent years trying to instill this viewpoint into her. The situation at the time makes Illya wish that her grandfather hadn't been so quick to throw aside Kiritsugu's views.
    • Rin mentions a magical device her family made that allows communication between two points. Shirou asks “what if you want to call someone else?”, and says that they shouldn’t disregard technology out of hand if they can help even the odds.
  • Mythology Gag:
    • Eggman's plot that sends the Sonic characters out of their world is called the Genesis Ray.
    • Sonic ends up in Shirou's yard in a familiar way, and even how they ended up in the Nasuverse is similar.
    • Mr. Stuart shows up as a teacher at Shirou's school.
    • Tails uses his Miles Electric to read a document on Ring Synthesis, written by a Sir Charles the Hedgehog.
    • Run believed that the only way to meet a kitsune is to summon Tamama No Mae as a Servant.
    • A number of characters mention a cafe staffed by Nekos.
    • On Shirou's decision to go to school without Saber, Rin points out that if they weren't in an alliance, she would have attacked him the minute he stayed behind to clean the Archery Club's room, something she did in the Unlimited Blade Works route and both anime adaptations.
    • Bazett partners up with Amy. Later, Avenger appears and takes on a copy of Shirou's form, and then starts fighting with the powers of the fallen Servants of the Fourth War.
    • Shirou's collection of "certain materials" is hinted at when he's thinking of a place to hide his father's papers.
    • The first casualty in the War is Rider, just like in the Fate and UBW routes of the original visual novel. Bonus points for being killed while using Bellerophon just like in the Fate route.
    • Once again, Sella and Leysritt end up dead at Gilgamesh's hands, just like in the UBW route. Gilgamesh also kills Caster and Souichirou, just like he did in the Fate route (albeit off-screen in the latter's case).
    • (Fake) Assassin ends up getting screwed over by Zouken, just like in Heaven's Feel. This time, however, he's just forcibly taken as a Servant rather than Eaten Alive for the True Assassin's summoning.
  • Narrative Profanity Filter: Anyone who's read the original visual novel knows what Sakura's "Training" consists of. But whenever the subject comes up, the story glosses over it and usually only shows the other characters disgusted/horrified reactions.
  • Noodle Incident: From the Fate perspective, the constant allusions the Sonic characters make to their past adventures. Also, one time Knuckles apparently got his head stuck in a drain pipe.
    • Whatever happened with one of Avenger's monsters in the Matou library, all we see is Cubot spotting it, then a cut to five minutes later where Shinji is trying to explain things to Zouken, with Eggman somehow capturing the creature.
  • No One Could Survive That!: Rin is utterly convinced that Eggman was killed after Saber Excalibur'd his flying airship and reacts with shock and disbelief when Sonic and Tails frankly tell her he's still around. Tails then recounts how Eggman survived falling into a black hole during one of his previous schemes blowing up in his face.
  • No OSHA Compliance: Lampshaded with Eggman's design choices for his vehicles and bases, with pitfalls in the middle of pathways, etc., with Sonic wondering if he has to cut back on materials mid-way through to make sure he has enough or something.
  • Not a Morning Person: Rin. When Tails sees her, he's kind of shocked to see a veritable zombie instead of her normal self.
  • Not Completely Useless: Structural Analysis is often viewed as a rather low-level bit of Magecraft, but Shirou proves it's amazingly useful in figuring out weak points in even the strongest of Eggman's robots, which are capable of taking on even Servants on a somewhat even keel.
  • Not So Different:
    • When she sees that Shirou came to school without his Servant for protection, Rin becomes irate...even moreso when she realizes that in leaving Archer at her mansion to watch Tails, she did the same thing!
    • Shinji, upon being called a failure by Zouken, points out that even with Magecraft, Zouken failed to win previous Grail Wars, and this time around forced Sakura to take part rather than joining himself, much how Shinji relied on Rider. He takes great joy in claiming Zouken is "Worse than me." According to Taiga, they are also similarly greedy and shortsighted.
    • When fighting Archer, Assassin asks if he is also a fake Servant, feeling something in his strikes.
  • Oh, No... Not Again!: This is basically the Sonic characters' reaction to be flung into Another Dimension.
  • Out, Damned Spot!: Shinji does this after learning The details of Sakura's "training".
  • Outside-Context Problem: Dr. Eggman to the Grail War and Magi society in general. He uses robots and technology far beyond anything else the Nasuverse has, and he's both able and willing to operate in the open and in broad daylight. Sonic and the gang are more heroic and oppose his attempts at world domination, but they're still operating too openly to easily keep under wraps, even appearing on the news and leaving numerous witnesses.
  • Paper-Thin Disguise: When forced to confront Eggman in public, Saber takes a Kamen Rider mask from the high school's drama club and wears along with her normal battle dress to protect her identity. Notably, this only fools those who don't already know Saber is a Servant.
    • Similarly, Illya wears a mask of her own when she and Berserker fight against an Eggman Robot.
  • Phlebotinum Overload: The Chaos Emeralds are so potent that while a magus could tap into their power, doing so recklessly or too much can overwhelm them with their energy.
    • In the first chapter, Shirou is egged on by Sonic to demonstrate his Projection spell. Little do they realize that a Chaos Emerald has ended up underneath Shirou's shed, and Shirou nearly rips his body apart when he unwittingly taps into that power. The narration says the sensation was like his nerves being turned into fire.
    • In Chapter 13, something similar happens to Rin when she tries to tap into the power of the Chaos Emerald intentionally, despite warnings from Shirou not to, in order to show him up. She massively underestimates its power, and the surge of Prana nearly sends her into cardiac arrest due to her finely-honed senses, and if she hadn't dropped the Emerald from the shock it would have done worse. Illya nearly suffers a similar fate when she gets cocky with her own abilities in touching an Emerald.
    • Even Caster isn't immune to this, as her over relying on the Emerald she obtains starts to have a negative backlash on her. She compensates by building a "power grid" to siphon off energy without receiving backlash in her lair.
  • Phrase-Catcher: The infamous "I hate that hedgehog!" is applied to Sonic by not just Eggman, but also Lancer, Rin and even Gilgamesh.
  • Porn Stash: Shirou implies that he has one when he's thinking of a place to hide his father's papers, mentioning a hidden compartment in his bedroom.
  • Punched Across the Room: This is how Knuckles pays Caster back for her deception and his imprisonment- by slugging her so hard she goes flying away from her safe spot and into the labyrinth that acts as her lair.
  • Pyrrhic Victory: Chapter 17 ends with the gang defeating Caster, saving Saber, and even getting the Chaos Emerald. Too bad Gilgamesh decided to crash the party and killed Sella and Leysritt, Caster and Souichirou are most likely dead at the hands of an angry Gilgamesh after Sonic gets them all out, and (Fake) Assassin is taken by Zouken as a Servant.
  • Reality Ensues: In order to save Taiga from being controlled by Caster, who is using her Chaos Emerald to boost her magecraft to the point that Illya is incapable of breaking the spell, Shirou Projects and uses Rule Breaker, a dagger that can break magic spells. It works, but then Shirou realizes that he needs to get Taiga to a hospital because he just stabbed her with a dagger.
  • Technobabble: Rin actually hears the word when Tails tries to explain the Ring Synthesizer.
  • Sanity Has Advantages: It is again lampshaded that Hercules would have been absolutely unbeatable in any other class besides Berserker.
  • Seen It All: Sonic and the gang have been through so much craziness that they've taken being transported to the Nasuverse with relative ease.
  • Science Cannot Comprehend Phlebotinum: The fact that Eggman and Tail's instruments for detecting Emeralds can pick up magecraft, which normal technology cannot, is a major part of the Broken Masquerade.
  • Screw This, I'm Outta Here!:
    • Sonic and Tails leave once Illya says she and Berserker don't drain the mana of innocents, though she chases after him.
    • Shinji scrams to a motel when he hears that Eggman can sense magecraft.
    • When Stuart is asking Kazuki about Caster, the former notices the latter, a suspected former assassin and apparently nearly emotion-less man, is blushing, and realizes more about their sex life than he ever wanted to know. Cue quick exit the second he's able to without blowing his cover.
    • As in the Heaven's Feel canon route, when Shinji's Book of False Attendant is destroyed, Rider ditches him.
    • Caster flees with Saber (and an unwilling Knuckles) when Illya and Berserker show up.
    • Sonic uses Chaos Control to allow the group to flee from an enraged Gilgamesh.
  • Shout-Out:
  • Sliding Scale of Idealism vs. Cynicism: Archer has a bit of a personal beef with Sonic for this reason, namely the fact that Sonic lives in a world where he can achieve the ideal dream of being a "Hero of Justice" that he himself never could. When they fight each other after Archer goes to Caster's side, Archer surprises even himself with how much his usual control becomes compromised as he tries to pick apart Sonic's reasons for fighting only for himself to start doubting.
    Oh, hearing those words ("There's nothing wrong with helping people, am I right?") struck at Archer's core. They struck him more than witnessing his old foolishness in Shirou had. Because from Sonic, those words were more than a coping mechanism. A desperate justification. And it was a reminder of where those ideals had led him.
  • Something Only They Would Say: Knuckles does this when Shirou claims to know Sonic. Shirou starts talking about a time when the echidna got his head stuck in a drainpipe.
  • Spanner in the Works: As the official summary notes, Sonic is a walking chaos factor, and the presence of him and his friends, as well as Eggman, is throwing the Grail War into turmoil (more so than already at least).
  • Squick: Shinji after seeing Sakura's "training", barfing. Orbot and Cubot simply erase their memories of the experience.
  • Stations of the Canon: Discussed in chapter 10's Tiger Dojo; Because Destiny Says So, Fate characters will subconsciously try to act like they would in their canon routes. However, the appearance of the Sonic characters is throwing everything Off the Rails.
  • Strange Minds Think Alike: Multiple characters, from Sonic and Tails to Eggman, refer to Servants as "Magic ghosts".
  • Sufficiently Analyzed Magic:
    • This is the distinction point between magecraft and True Magic; magecraft is reproducible by science, while True Magic is beyond that.
    • Eggman likes to analyze the supposedly supernatural, like the Chaos Emeralds, and find means of exploiting it.
  • Tarot Troubles: Tarot cards are apparently non-magical in the Nasuverse, but Amy's, which led her to Sonic on Little Planet, are, and lampshade the big mistake Shinji made by telling Eggman about the War.
  • Survivor's Guilt: Shirou's got an intense case of this due to not saving any of the other people who suffered and died around him in the Fuyuki Fire, which fuels both his Chronic Hero Syndrome and his tendency to refuse others' help, since he feels like he doesn't deserve it. Sonic hits this right on the head in Chapter 14, comparing it to Shadow (minus the rage against the world) and telling Shirou in no uncertain terms that while being a hero's noble, he can't save everyone by himself and it's not a weakness to rely on others (after all, he does it).
  • There Was a Door: When Knuckles goes to check out the school, Rider is watching, and asks herself why he broke a window when there was a door right next to him.
  • The Thing That Would Not Leave: Illya becomes this for the night after Shirou treats her to a Kamen Rider movie.
  • Too Much Information: Stuart, when questioning Kazuki about Caster, learns more about their sex life than he ever wanted to know.
  • Undead Tax Exemption: When Stuart tries to do a background check on the Servants who have appeared publicly, such as Saber and Caster, he realizes that he can find no official record of any of them existing. The most he finds is that the credentials Saber used when she entered Japan during Fate/Zero were falsified.
  • Underestimating Badassery:
    • The Sonic characters tend to get underestimated, especially the first time around.
    • Magi, in general, are ignorant and/or dismissive of technology, and underestimate how dangerous it can be to them, as Kiritsugu and Eggman have both shown in great detail (the latter especially, since his tech is miles beyond most Nasuverse tech). Bazett makes a full about-face on this stance during a fight with one of Eggman's giant mechs when she nearly gets killed by a stray mortar shell, and the narration notes that one of the things she now wants is a bulletproof vest.
    • Caster underestimates Knuckles' ability to escape from his cocoon of chains, and promptly gets decked on. Though it should be noted that was only possible thanks to Archer Projecting Rule Breaker to break his enchanted slumber in the first place.
  • Villain: Exit, Stage Left: Eggman is skilled at pulling these off. One actually saves his life against Archer.
  • Villain Team-Up: Shinji and Eggman form an alliance in Chapter 10, Magi. Of course, it's made clear they're both ready to turn on each other when necessary.
  • We Can Rule Together: Caster gives a speech to Archer about this. He then allows her to Rule Breaker him.
  • Worf Barrage: As usual,, Lancer's Noble Phantasm fails to do anything when he uses it on Sonic, demonstrating the protective powers of the Power Rings. Notably, Sonic still feels the pain of being hit, but the spear doesn't actually damage his body.
  • World of Badass: Shirou notes that people with special and powerful abilities, like Sonic's Super Speed, seem to be common on his world.
  • Wrong Genre Savvy:
    • The Grail War operates under extreme secrecy, as The Masquerade details. Rin expected Dr. Eggman to operate under the same rules, but was proven wrong when he attacked the school in broad daylight thinking an Emerald was there. She also underestimates how capable he is at escaping situations where his death should be assured.
    • Eggman himself was unprepared for how pragmatic and ruthless Archer can be, not expecting the Servant to actually try and kill him instead of capturing him. Only the fact he had an escape plan saved him (and taking Rin along for the ride).

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