''[[https://www.fanfiction.net/s/9958540/1/Magna-Clades Magna Clades]]'' is a ''WesternAnimation/StevenUniverse'' fanfic written by Creator/{{Voltalia}} concerning the OriginalCharacters Zoisite and Onyx going around, killing people, and the Crystal Gems having to stop them.

!!This fanfic uses the tropes:
* AnyoneCanDie: Well, anyone who's ''human'' can die as Zoisite and Onyx are kind enough to demonstrate.
* BigBad: Zoisite.
* BilingualBonus: The title translates to "a great disaster" in Latin.
* BlobMonster: Zoisite first shapeshifts into this in chapter 3 and uses the form to strike at his victims.
* BloodierAndGorier
* BrainBleach: Most of the gory scenes (and the rape scene in chapter 8) should have this on standby.
* CruelAndUnusualDeath: Zoisite and Onyx inflict these on their victims. Onyx blows a woman ''to smithereens'' and then graphically tears her boyfriend's neck apart with her telekinesis in the first chapter, while Zoisite shapeshifts into a white blob, starting as early as chapter 3, just so he can ''liquify people to death!''
* TheDragon: Onyx.
* {{Egopolis}}: The Chalcopyrite Queendom is said to have been named for its very first ruler.
* EvilChancellor: Zoisite is supposed to be this. Pearl says he may've been responsible for the Queen Jubilee's death.
* FantasticRacism: Zoisite is prejudiced against humans and wants them all killed because he doesn't believe they deserve to breed with Crystal Gems.
** In fact, he hates Steven for being a [[HalfHumanHybrid "half-breed"]].
* FantasyCounterpartCulture: The Chalcopyrite Queendom is supposedly based off of the Roman Empire.
* GoOutWithABang: [[spoiler: Zoisite]] and [[spoiler: Zirconia]] literally die this way.
* {{Gorn}}: There's a ''lot'' of this in the fanfic.
* GoshDarnItToHeck: The only real curse word used throughout the fic is "damn."
* InMemoriam: Chapter 9 onwards is dedicated to Creator/JewWario, who [[AuthorExistenceFailure committed suicide]] while it was being written, via author's note.
* KillEmAll: What Zoisite plans to do to all the humans.
* OhMyGods: The Gems swear, "Oh my Goddess!" throughout the fanfic.
* QuestForTheRest: First started in chapter 4 and completed in chapter 9. This is actually more of a search for help in defeating Zoisite than anything else.
* RapeAsDrama: In chapter 8, Zoisite proceeds to have his way with [[spoiler: Connie]] while Peedee and his parents watch in horror.
* StressVomit: Steven throws up after [[spoiler: accidentally killing Zoisite and Zirconia]].
* WhatHappenedToTheMouse: By the end of the fanfic, Cinnamon and Onyx have completely vanished from the plot.
* WhiteHairBlackHeart: Zoisite. Combined with MysticalWhiteHair.