The Persistence of Loss is a CrossOver fanfic by [[http://www.fanfiction.net/u/3583214/TrippyToastersAndABagOfChips TrippyToasterAndABagOfChips]], between the VideoGame/GoldenSun and Franchise/KingdomHearts video games, specifically taking place after [[VideoGame/GoldenSun TLA]] and near the end of [[VideoGame/KingdomHearts358DaysOver2 Days.]] It is complete, with a total of 35 chapters.

After returning from her time away with Riku, Xion is having second thoughts about her plan to be reabsorbed into Sora's memories. [[ScrewDestiny Deciding not to follow the plan after all]], she flees Organization XIII once again, this time running to an outer world where she believes nobody will find her: Weyard.

At the chasm where Mt. Aleph once stood, she runs into a very bitter and angry Felix, who has become obsessed with the idea of killing Alex for [[MisplacedRetribution causing all the misfortune in his life]]. After a few misadventures, they agree to stick together and help each other, while keeping their individual secrets to themselves.

While the fic follows the two games' canon at first like a typical crossover, it eventually diverges into an AU fic with [[AnyoneCanDie a few character deaths]] that make the canon sequels more or less impossible.

It can be found [[http://www.fanfiction.net/s/7956093/1/The_Persistence_of_Loss here]] and [[http://archiveofourown.org/works/519032/chapters/916982 here.]]

!! This fanfic provides examples of:
* ActionGirl: Xion, especially after the Mercury Lighthouse arc.
* AntiHero: Felix, even more so than his canon self.
** Axel as well.
* AnyoneCanDie
* AuthorAppeal: The fight scenes can get awfully descriptive at times...
* AxCrazy: [[spoiler: Luxord during his possession.]]
* BackFromTheDead: [[spoiler: Mia, but it doesn't last very long.]]
* BerserkButton: For Felix, it would be threatening Xion or Jenna. For Xion, it's Axel and Roxas.
* BigBad: Alex for most of the story. [[spoiler: Lunos during the climax.]]
** BiggerBad: Xemnas. While he's still the leader of Organization XIII, he doesn't really do much in the fic, and disappears with Xigbar near the end.
* BigDamnHeroes: Happens a lot.
* BodyHorror: What happens to [[spoiler: Luxord when he is possessed by Lunos.]]
** Also, [[spoiler: Alex's regeneration powers]].
* BreakTheCutie: Xion undergoes a number of awful situations that gradually eat away at her naivete, [[spoiler: the peak of which being when she has to kill Riku at Venus Lighthouse.]]
* CharacterDevelopment: As the story progresses, Felix grows less bitter and cynical, and Xion gradually comes to grips with her artificial nature.
* CurbStompBattle: Several, most notably Felix's first encounter with Alex.
* DamselInDistress: Xion, a few times. Somewhat justified, as she loses her keyblade and magic when she goes to Weyard, and has to learn new skills before being competent in battle again.
* DarkerAndEdgier: Much more so than the games it is based on.
* {{Determinator}}: Several characters, but most especially Riku.
* DiabolusExMachina: [[spoiler: Just about anything Lunos does. As one reviewer put it, he's like a deus ex machina, except he creates problems rather than solving them.]]
* TheDragon: Saix to Xemnas, and [[spoiler: Blados]] to Iodem.
* EldritchAbomination: [[spoiler: Lunos' true form.]]
* FiveManBand: The group in later chapters:
** TheLeader: Felix.
** TheLancer: Axel.
** TheBigGuy: Garet.
** TheSmartGuy: Piers.
** TheChick: Xion.
* FromBadToWorse: A common twist in climatic fights.
* AGodAmI: Alex. [[spoiler: It's implied that is was all an act, as in the final chapter he seems perfectly ration and humble about his power.]]
* HeelFaceTurn: Axel. Demyx as well, to a degree.
* HeroicBSOD: Felix has one after [[spoiler: Mia is killed.]]
* KilledOffForReal: [[spoiler: Luxord, Mia (twice), Jenna's baby, Iodem, Babi, Demyx, Riku, Roxas, The Wise One, Xaldin, Xion, and finally Lunos himself. Mia and Xion get better, however, and it's implied that Riku also survived.]]
* LoveTriangle: Between Felix, Mia, and Garet. Another one may be forming between Felix, Xion, and Roxas (or possibly Axel).
* MacGuffin: The Essences Xion is collecting.
* MeaningfulName: [[spoiler: Lunos. He's the ruler of the Anemos, who turned their city into the moon.]]
* MindScrew: Everything involving Jasmine, [[spoiler: Jenna's doppelganger.]]
* MoodWhiplash
* OneWingedAngel: [[spoiler: Luxord, when Lunos takes over his body.]]
* PlotRelevantAgeUp: Xion has one after [[spoiler: she kills Riku]], due to drawing five years of experience from some source of energy. The side effect being that she also aged five years.
* {{Retgone}}: [[spoiler: When Alex kills Jenna's baby, it is somehow wiped from existence and nobody seems to remember it. Except Xion, who then starts having nightmares of a [[VideoGame/KingdomHearts358DaysOver2 similar event]] happening to her...]]
* RuleOfCool: The fight scenes practically run on it.
* SealedEvilInACan: [[spoiler: Alex becomes this, after he is chopped into little pieces and locked away to prevent the pieces from reforming.]]
** [[spoiler: Lunos, as well.]]
* SlidingScaleOfIdealismVersusCynicism: Felix is on the far end of the Cynical side, and Xion is on the Idealist side.
* StatusQuoIsGod: Averted. The author makes zero effort to make the fic compatible with the chronological sequels.
** InSpiteOfANail, however, the story ends in a way that makes the sequels still plausible, at least on the VideoGame/GoldenSun end. [[spoiler: Alex overhears a conversation between Blados and Chalis, implying that the Tuaparang are still going to happen, though he doesn't seem interested in joining them. Sora survives, and is going to go look for Riku, who may still be alive. And Xemnas and Ansem are still out there, as well.]]
* StoryArc: The fic is divided into five-or-so chapter arcs, defined by where the characters currently are. In order: Loho, Imil/Mercury Lighthouse, Kalay, Tolbi/Venus Lighthouse, and Contigo/Jupiter Lighthouse/and the finale.
* ThemeNaming: All of the chapter names, as well as the name of the fic itself, are taken from Music/NineInchNails songs.
* TookALevelInBadass: Xion, during her fights with [[spoiler: Blados, and later Riku.]] In the latter, she actually gains five years of combat experience in a single second, which allows her to use a Psynergy far beyond her skill level.
* TrueCompanions: The Warriors of Vale, carrying over from VideoGame/GoldenSun.
* YourHeadAsplode: [[spoiler: How Luxord dies.]]