Cover Image

Harry Potter and the Prancing of Ponies

by The Guy Who Writes
Dumbledore doesn't reverse the trap he laid on the Mirror in time. The Mirror traps Harry and Voldemort outside of Time... and inside the MLP universe. MLPxHPMoR Crossover.

Formal Premise: The inventors of the Mirror wanted to create a device that could channel infinite magic and grant wishes. The hard part was making sure those wishes would never destroy the world. Showing a person their heart's desire is a sensible precaution to put into a wish-granting machine designed NOT to go horribly wrong.

The Atlanteans got close, even managing to imbue some amount of intelligence and morality into the Mirror. But they never finished their work; the Mirror never DID get to the point where it could grant wishes... at least, nobody believes it ever got to that point. But then, nobody has ever been trapped inside the Mirror and returned to tell the tale.

When the Mirror traps someone inside itself and outside of Time, that person and their consequences can no longer affect the world. In that circumstance, with a person fully under its power, the Mirror isn't limited in what it can do. Sometimes, it can even grant seemingly incompatible wishes.

But complex problems require complex solutions. In this case, the Mirror takes a few massive liberties about how, exactly, it satisfies the wishes of both Harry Potter and Lord Voldemort. Namely, it sends them to a world of ponies.

Informal Premise: This is a crossover between MLP and Harry Potter and the Methods of Rationality, not just Harry Potter. No matter how accessible I try to make it to those who haven't read HPMoR, those who HAVE read it will undeniably have an easier experience reading this story.

HPMoR is the second most popular fanfiction of Harry Potter, at least according to fanfiction stats. It involves Harry studying & dissecting the wizarding world with science. Not with technology, with actual science. That is, he uses the experimental method, generates and tests hypotheses, and in the words of his Occlumency instructor, "wants to discover the underlying rules of magic to become all-poweful".

THIS fanfic brings THAT version of Harry Potter to Equestria. It also brings that story's version of Voldemort.

If you want the best reading experience, please go read HPMoR first. It can be found on fanfiction dot net, or on its own website, or even on any podcast app, as it has its own fan-made audiobook with 30+ contributing voice actors, production quality, sound effects, music, etc. (which is more than can be said for most PROFESSIONAL audiobooks).

Link to HPMoR on fanfiction: https://www.fanfiction.net/s/5782108/1/Harry-Potter-and-the-Methods-of-Rationality
Link to HPMoR on its own website: http://www.hpmor.com/chapter/1
Link to audiobook (though the website isn't nearly as good as podcast apps): https://hpmorpodcast.com/?page_id=56

All forms of HPMoR that I've encountered are high quality, but that doesn't mean it's for everyone. You can probably read the first few chapters of HPMoR in thirty minutes or so. If it doesn't appeal to you, this story probably won't appeal to you either.

For those who haven't read Methods and want to read this story anyway, the first two chapters are going to be the most confusing. They're mostly housekeeping and stage-setting, barely touching the MLP universe beyond the new setting.

And I think the same advice Yudkowsky gave for HPMoR applies here. The story starts hitting its strides around Chapter 5, if not sooner. If you don't like it by Chapter 10, best just to give up and read something else.

Teen
Incomplete
Alternate Universe
Science Fiction
Adventure
Harry Potter
Crossover
My Little Pony: Friendship is Magic
 

608492 words: Estimated 2 days to read
Download:textHTMLePUB

122 Chapters:

  1. Chapter 1: A Trap of Very Low Probability 2021-03-28 05:36:54 UTC
    4143
  2. Chapter 2: HE'S THE END OF THE WORLD... as we know it. 2021-04-02 00:37:08 UTC
    7249
  3. Chapter 3: Resurrection? 2021-04-05 02:20:24 UTC
  4. Chapter 4: Reconnaissance 2021-04-09 23:30:56 UTC
    3660
  5. Chapter 5: Restarting the March of Reason 2021-04-16 23:12:25 UTC
  6. Chapter 6: Nightmare Moon and a Riddle 2021-04-24 01:01:47 UTC
    3076
  7. Chapter 7: Plans for the Future 2021-04-28 16:58:36 UTC
    4469
  8. Chapter 8: Placement Tests 2021-05-08 03:20:43 UTC
    3394
  9. Chapter 9: Friendship Meddling 2021-05-11 01:03:17 UTC
    3348
  10. Chapter 10: Progress 2021-05-15 06:00:29 UTC
    4342
  11. Chapter 11: Laps 2021-05-19 15:02:42 UTC
    5672
  12. Chapter 12: Determined to Disprove 2021-05-21 06:33:19 UTC
    2577
  13. Chapter 13: Faith in Others 2021-05-30 19:32:27 UTC
    3627
  14. Chapter 14: The Fosbury Conspiracy 2021-06-05 02:33:29 UTC
    6509
  15. Chapter 15: Efficient Learning Practices 2021-06-11 23:55:43 UTC
    4392
  16. Chapter 16: Invitations 2021-06-13 01:44:15 UTC
    5856
  17. Chapter 17: First Lesson 2021-06-15 05:50:48 UTC
    6855
  18. Chapter 18: Waiting 2021-06-17 01:25:40 UTC
    5193
  19. Chapter 19: Participation 2021-06-18 23:56:42 UTC
    4991
  20. Chapter 20: Royal Courts 2021-06-21 17:34:17 UTC
    6233
  21. Chapter 21: Royal Responses 2021-06-23 14:34:29 UTC
    4283
  22. Chapter 22: Foil 2021-06-24 19:17:18 UTC
    3690
  23. Chapter 23: Safety and Practice 2021-06-26 01:06:22 UTC
  24. Chapter 24: First Day on the Job 2021-06-28 18:24:14 UTC
    5020
  25. Chapter 25: Possibly False Hope 2021-06-30 03:36:52 UTC
    3268
  26. Chapter 26: Truth vs. Honesty 2021-07-01 04:40:22 UTC
  27. Chapter 27: Going Through the Motions 2021-07-06 00:13:57 UTC
    4799
  28. Chapter 28: Infinite Solution Space 2021-07-07 15:11:16 UTC
    3169
  29. Chapter 29: New Life 2021-07-08 14:38:30 UTC
    3550
  30. Chapter 30: Twilight's Troubles 2021-07-10 19:40:55 UTC
  31. Chapter 31: Afterparty 2021-07-12 04:57:21 UTC
    3136
  32. Chapter 32: Goals 2021-07-13 17:52:45 UTC
    3761
  33. Chapter 33: Placement Tests, Round 2 2021-07-16 19:32:10 UTC
    3422
  34. Chapter 34: Mature Choices 2021-07-22 03:48:44 UTC
    4575
  35. Chapter 35: Politics, Policies, and Debate 2021-07-30 20:56:37 UTC
    6762
  36. Chapter 36: Humanmagi 2021-08-03 22:07:38 UTC
  37. Chapter 37: Incompatible? 2021-08-05 16:23:36 UTC
    3121
  38. Chapter 38: The Gala 2021-08-07 00:56:55 UTC
    4794
  39. Chapter 39: Attempted Affection and its Aftermath 2021-08-09 00:09:06 UTC
    3553
  40. Chapter 40: A Fair Exchange of Favours 2021-08-13 16:49:15 UTC
    4526
  41. Chapter 41: The Unbreakable Vow, and a Hint of Revenge 2021-08-20 22:37:22 UTC
    4194
  42. Chapter 42: Bring Your Youngling to Work Night 2021-08-22 14:38:35 UTC
    3524
  43. Rehabilitation, Part 0: Diagnosis 2022-03-28 02:04:39 UTC
    7540
  44. Chapter 43: The Night of Summer Sun 2022-03-18 00:59:28 UTC
    7051
  45. Chapter 44: Generosity 2022-04-02 22:30:51 UTC
    4300
  46. Chapter 45: Gatekeeper 2022-04-10 17:29:45 UTC
    3618
  47. Chapter 46: Terms and Conditions Apply 2022-04-16 00:17:33 UTC
    8290
  48. Chapter 47: Bypass 2022-04-22 22:27:53 UTC
    9494
  49. Rehabilitation, Part -1: Double Bypass 2022-05-01 20:47:34 UTC
    5780
  50. Chapter 48: Declaring War on the World 2022-05-01 20:47:41 UTC
    1558
  51. Rehabilitation, Part 1: Motivation 2022-05-06 01:40:23 UTC
    3543
  52. Rehabilitation, Part 2: Heart 2022-05-09 12:50:47 UTC
    7518
  53. Rehabilitation, Part 3: Hesitation 2022-05-11 14:33:18 UTC
  54. Rehabilitation, Part 4: Temptation 2022-05-13 23:09:05 UTC
    1908
  55. Chapter 49: Declaring War on the World('s Dementors) 2022-05-15 03:03:32 UTC
    5368
  56. Rehabilitation, Part 5: Harmony 2022-05-19 15:13:33 UTC
    7423
  57. Rehabilitation, Part 6: Chaos 2022-05-25 16:56:52 UTC
    10368
  58. Rehabilitation, Part 7.1: Attempted Murder 2022-06-11 23:56:03 UTC
    5737
  59. Rehabilitiation, Part 7.2: Successful Murder 2022-06-17 22:12:59 UTC
    8728
  60. Chapter 50: The Big Lie 2022-06-20 09:15:27 UTC
    4262
  61. Chapter 51: The Big """"Truth"""" 2022-06-25 00:10:44 UTC
    7762
  62. Rehabilitation, Part 7.3: "Full" Disclosure 2022-07-03 00:17:10 UTC
    10294
  63. Rehabilitation, Part 8.1: Night Court 2022-07-09 00:39:10 UTC
    6565
  64. Rehabilitation, Part 8.2: Decent Exposure 2022-07-16 12:46:42 UTC
  65. Chapter 52: Family Reunions 2022-07-22 23:01:05 UTC
    7974
  66. Chapter 53: Lucius Malfoy, from Past to Present 2022-07-29 23:01:11 UTC
    6141
  67. Chapter 54: The Wisdom of the Wizengamot 2022-08-05 22:19:28 UTC
    9707
  68. Rehabilitation Part 9.1: Learning from History 2022-08-14 23:55:10 UTC
    5863
  69. Rehabilitation Part 9.2: Drastic Measures 2022-08-19 22:29:44 UTC
    8750
  70. Rehabilitation Part 9.3: The Will to Kill 2022-09-16 19:33:26 UTC
    4623
  71. Rehabilitation, Part 10.1: Relapse 2022-11-02 03:58:15 UTC
    2250
  72. Chapter 55: Politics, Military, Virtue 2022-11-06 13:41:57 UTC
    5997
  73. Chapter 56: The House Cup and the Wisdom of Wizardry 2022-11-12 23:00:53 UTC
    2710
  74. Rehabilitation Part 10.2: Relief 2022-11-26 15:45:28 UTC
    1517
  75. Chapter 57: Severus Snape 2022-11-21 16:07:01 UTC
    5624
  76. Rehabilitation Part 10.3: Treating Morality as a Relationship 2022-12-11 01:59:20 UTC
    2506
  77. Chapter 58: Summer Plans 2022-11-29 21:01:16 UTC
  78. Rehabilitation 10.4: Comas, Emergencies, and Apologies 2022-12-22 04:57:38 UTC
    3410
  79. Chapter 59: The Adults in Diagon Alley 2022-12-14 20:37:18 UTC
    7622
  80. Rehabilitation 10.5: Immune System of the Soul 2023-01-20 05:42:52 UTC
    6535
  81. Chapter 60: Return to Equestria 2023-01-05 00:12:10 UTC
    7562
  82. Rehabilitation 10.6: Property Rights vs. Property Reichs 2023-02-20 04:00:51 UTC
    6087
  83. Chapter 61: Worlds Collide 2023-02-05 17:00:04 UTC
    6599
  84. Chapter 62: Humanity's Debut 2023-02-27 02:29:54 UTC
    7460
  85. Chapter 63: Heroic Opposition 2023-03-06 00:41:11 UTC
    3681
  86. Chapter 64: All Fun and Games 2023-03-12 04:29:44 UTC
    4552
  87. Rehabilitation 11.1: Master Fool 2023-03-19 01:14:25 UTC
    5252
  88. Rehabilitation 11.2: Trip to Tartarus 2023-03-26 00:00:14 UTC
    5719
  89. Rehabilitation 11.3: Consulting Magic 2023-04-09 02:00:30 UTC
    6493
  90. Rehabilitation 11.4: Canterlot Conference 2023-04-23 23:20:42 UTC
    6811
  91. Chapter 65: New Hire 2023-05-10 01:47:14 UTC
    5654
  92. Rehabilitation 11.5: Consulting Willpower 2023-05-21 23:40:10 UTC
    3725
  93. Chapter 66: Ponyback Rides 2023-06-12 01:24:28 UTC
    4628
  94. Rehabilitation 12.1: Dilemma 2023-06-18 17:49:34 UTC
  95. Rehabilitation 12.2: Letting In 2023-06-23 22:01:21 UTC
    6745
  96. Chapter 67: Express Permission 2023-07-01 01:02:18 UTC
    7887
  97. Rehabilitation 13.1: Thinking Inside the Boxes 2023-07-07 23:23:54 UTC
    7445
  98. Chapter 68: New Year, New and/or Old Problems 2023-07-15 01:37:17 UTC
    6802
  99. Rehabilitation 13.2: Conspiracy Counter-Theory 2023-07-21 22:26:50 UTC
    7768
  100. Chapter 69: On the Other Foot 2023-07-28 23:27:31 UTC
    3480
  101. Rehabilitation 13.3: Beyond the Veil 2023-08-18 22:32:40 UTC
    6523
  102. Chapter 70: Touring the Truth 2023-09-10 18:51:38 UTC
    7956
  103. Rehabilitation 13.4: We Shall Not See Each Other Again 2023-10-14 03:34:37 UTC
    9048
  104. Chapter 71: Are You Prepared? 2023-10-20 23:34:34 UTC
    5909
  105. Rehabilitation 13.5: When Your House Eats a Dark Lord... 2023-10-28 00:01:20 UTC
    8439
  106. Chapter 72: Blinded By The Light 2023-11-03 20:39:26 UTC
    9779
  107. Rehabilitation 14.1: A Tendency Towards Tyranny 2023-11-10 01:43:36 UTC
    7227
  108. Chapter 73: Find the Celebrity 2023-11-12 14:50:48 UTC
    11617
  109. Rehabilitation 14.2: Securing Knowledge 2023-11-15 19:25:54 UTC
  110. Chapter 74: NO 'ELP! 2023-11-17 17:38:36 UTC
    4994
  111. Rehabilitation 14.3: The Unearned Climax 2023-11-22 12:10:22 UTC
    6996
  112. Chapter 75: Ascending Above Addiction 2023-11-25 23:06:32 UTC
    7204
  113. Rehabilitation 14.4: Constant Vigilance 2023-12-03 20:57:58 UTC
  114. Chapter 76: The Color of the Sky 2023-12-08 12:37:25 UTC
    3173
  115. Rehabilitation 15.1: Sanctioning Starlight 2024-01-07 17:54:17 UTC
    6179
  116. Chapter 77: Ignorant and/or Impotent 2024-01-13 16:08:41 UTC
    4228
  117. Rehabilitation 15.2: Sessioning Starlight 2024-02-04 03:23:45 UTC
    2707
  118. Chapter 78: UnKind 2024-02-18 19:59:43 UTC
    6740
  119. Rehabilitation 15.3: The Silent Killer of Happiness 2024-03-11 20:12:06 UTC
    4095
  120. Omake: Queen of England 2024-03-17 22:25:59 UTC
    1877
  121. Chapter 79: False Assumptions 2024-03-23 03:50:35 UTC
    5854
  122. Chapter 80: Convincing Your Heirs They're Right 2024-04-14 20:45:22 UTC
    6528