The Conversion Bureau never made any sense anyway, but here are some places where it would have made less sense.
Not necessarily worlds where the ponies would lose the fight - just worlds where conversion wouldn't logically work.

Before suggesting a World, read the index to make sure I haven't done it already.

[Second Person Perspective]

Once a year, you come around with a simple task. Most of the time, it means nothing. You are normally dismissed without another thought.

However, when you find out Princess Luna has been asking for you, you can't help but worry that something is wrong.

(Scene written for confirmed-by-voting best pony Luna. A bit of a mystery fic. See what details you can glean from the dialogue to determine who the character is and what they are talking about.)

Twilight Sparkle has spent months researching chaos magic, developing a new spell to unlock magic nopony has ever experienced before. But when something goes wrong with casting, Twilight finds herself turned into a Draconequus and unable to control her new chaos magic. If she ever wants to be a pony again, there is only one who can help her learn to control her new magic.

Of course, learning from Discord was never going to be simple. And after a while, being a draconequus doesn't seem so bad anyway....

Based on the concept by Lopoddity

Editing by DB_Explorer
Proofreading by Mac349 (Ch. 1-11), Trippy998, Just A Fabulous Cat (Ch. 1-5), Doctor Candor and skysthelimit (Ch. 1-11).

A human teenager meets an unidentifiable creature which gives him immortality, him and the creature call it a curse, it isn't fun, yet he wants to try to be with the new civilizations. If it wouldn't break his and their heart.

Twilight Sparkle gets the chance of researching and questioning the first live specimen of a changeling since the Canterlot invasion three years ago.
Twilight goes in with a scientific mind and wants to figure out everything about these evil bugs, as clearly they have shown themselves to be nothing but cruel in the past. However, in an attempt to find a cruel primitive being, she instead finds something she did not expect.
A teacher.

Story Tags and notes: There is going to be no explicit sex in this story, but gender, sex, and general reproduction will be a subject, as well as love, affection, morality, society and any other subjects that boggles my mind.
This story is something I made out of a combination of my own headcanon for changelings, and with my frustration, yet love, for philosophy, which I study at writing moment at university. This story will have slow updates, but I will work on it. This is as much a work for me, as it is for you.
I hope you´ll enjoy.

Fluttershy's father is captured by the villianous Discord, Phantom of the Opera! Can she save him while being pursued by the handsome and charming Prince Blueblood? What if she were to take her fathers place? Ponies meet Phantom of the Opera with a splash of Beauty and the Beast!

Plese check out a BRAND NEW 37 minute animated episode of The Phantom Opera Discord by SisterStories, it is AMAZING! - DEC 2020
https://www.youtube.com/watch?v=_2NVTOcuIc4&feature=youtu.be

Please check out this fully illustrated video of the first chapter! https://www.youtube.com/watch?v=mjDAbUQhqPc

HEAVY EDIT TIME: BE PREPARED FOR SOME POSSIBLE CONFUSION
Edited chapters have notes in the authors comment section with a date.
FOR ALL READERS: Celestia is now Fleur De Lis in early chapters but I haven't gotten to later chapters to change it.

Everything you need to know about this Universe:
http://www.fimfiction.net/blog/378914/have-questions-about-the-world-of-the-opera-phantom-discord

Beautiful Fanart: http://ameliacostanza.deviantart.com/art/Opera-Phantom-Discord-494273039

More Amazing Fanart: http://scribblescrabblesdabble.tumblr.com/image/87770244131
Fanart!: http://pre03.deviantart.net/17f4/th/pre/f/2015/123/0/7/mlp_fluttercord_ofd_by_nightmarederpy-d8s2ysd.png

More Fanart!: http://pre01.deviantart.net/f184/th/pre/i/2015/146/8/2/opera_phantom_discord__lovers_quarrel_by_ameliacostanza-d8uuvre.jpg

Fanart! 4/11/2021
https://www.deviantart.com/gemy123/art/Dance-with-me-875910176
https://www.deviantart.com/sisterstories/art/Opera-Phantom-Discord-Poster-2-644957982

Follow its Tumblr at operaphantomdiscord.tumblr.com

Shortly after her 1000 year isolation on the moon, Princess Luna finds herself lonely. That is until she enters the dream world of the only human in Equestria, Anon. Luna poses as a human girl named Laura in his dream who Anon falls in love with, and she too falls in love with Anon. Luna realizes she must confess to her true identity if she ever wants any chance of a relationship beyond the dreaming realm.

On Twilight's latest mission from Celestia, she travels back to the human world. Seeing it could do no harm, Celestia lets Rarity come with her. While she's there, she meets a hunk who calls himself Anon and another version of herself. Unfortunately for the boy, both of those Raritys love him.

Once upon a time in the magicless land of Earth, I was a simple geek on my way to comic con chosing to cosplay one of my favorite literary characters, Eragon.

Such a pity I never made it.

One meeting with a quite odd fellow, a purchase I wasn't entirely sure I wanted, and I was in Equestria holding my receipt.

No returns. No exchanges. All sales are final.

Available as a book!

It is a fact that horses have served mankind for thousands of years, in times of war and in times of peace. Your horse – a chestnut mare named Zayna – helps you to earn your primary source of income, in the form of a riding school.

But then, a freak occurrence dumps you both in a strange new land populated by talking ponies. At first, they are a bit hostile due to a misunderstanding — but that's nothing when you realise it's not just ponies who can talk here.

As it turns out, horses can as well.

AUTHOR'S NOTES

Featured on Equestria Daily.

This is NOT an Anonymous in Equestria story.

First two chapters edited by Shin Guyviroth.

Special thanks to Shachza and Alticron for their assistance.

Rated Teen for suggestive themes.