[[quoteright:240:'''''The Gemstone Saga:'''''\\
''[[https://www.fanfiction.net/s/9958540/1/Magna-Clades Magna Clades]]''\\
''[[Fanfic/DestinysChildAndHerBridegroom Destiny's Child And Her Bridegroom]]''\\
''Fanfic/{{Starchild}}''\\
''Fanfic/HereIAm''\\
''Fanfic/{{Symbiote}}''\\
''[[Fanfic/YoungAndBeautiful Young and Beautiful]]''\\
''[[Fanfic/DiamondsAreForever Diamonds are Forever]]''\\
''Fanfic/ReadyToRoll''\\
''[[Fanfic/TimeOfTheSeason Time of the Season]]''\\
''[[Fanfic/SaySomethingLove Say Something, Love]]''\\
''[[Fanfic/YggdrasilABraveNewWorld Yggdrasil: A Brave New World]]'']]

''[[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 is the very first story to be written in the ''Gemstone Saga'' and the first serious ''WesternAnimation/StevenUniverse'' fanfic Creator/{{Voltalia}} ever wrote. First making its debut the day after Christmas in 2013, it is currently one of the most popular stories, if not ''the'' most popular, she's ever written during her fanfic career. It pretty much established the universe and characters as they would be represented in future fanfics; for example, Beach City is explicitly said to be in California and the Gems originated from a dimension known as Mineralis.

!!This fanfic uses the tropes:
* [[spoiler: AccidentalMurder]]: Steven unintentionally pushes Zirconia right into Zoisite, [[spoiler: killing them]].
* 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.
* EstablishingCharacterMoment: The first thing we see Zoisite and Onyx do is kill a random couple who happens to be walking along.
* 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."
* KillEmAll: What Zoisite plans to do to all the humans.
* {{Novelette}}: The fanfic is sixteen chapters long, but has over 11,000 words.
* 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.