The story will never truly be finished because I'll keep adding monsters to it, but I keep the 'complete' tag for peace of mind.
Twilight, after pleading by Cheerilee, goes to the school of Applebloom, Scootaloo, and Sweetie Belle in order to teach the children there about what creatures they should never face. Regardless of how she explains it, the children almost have a heart attack.

Later down the line, she discovers an old booklet by a hunter named 'Spiral Tooth' and goes through their rather 'colorful' descriptions of the monsters they've encountered with Spike.

That Pic was done by Samaru163

This is basically just a bestiary of things that pass through my head that I might use in a book or for a story here at a later date.

To commemorate the imprisoning of Discord one year ago, the first annual Celebration of Harmony is starting off with a grand party in Canterlot, something Twilight Sparkle has been looking forward to after many sleepless nights plagued by nightmares. After a chance glance at the party, Twilight and Princess Luna rekindle their friendship sparked on Nightmare Night. Meanwhile, Princess Celestia grows worried over the state of her kingdom, her sister disappearing at odd times, and the seal placed on Discord. Are the princess's worries well founded or is her sister's oddly secretive behavior taking a toll on her nerves? Twilight gets caught between the sun and moon as both royal ponies reveal that there is much that history has forgotten about the nature of the alicorns and even the draconequus.

AU for not taking into account Season 3 canon.

Amazing cover art by Sai, check the image source for more of his great work!

What if Rainbow Dash had been present when Discord gave the Mane Cast their first shot at him? How could things have gone different? How could this have changed things?How could this have changed Twilight?

Update Schedule Below the Break.
Now with the super editor FredMSloniker!
Now with a wonderful cover image by Conicer!
Also - Awesome Fanart - http://nyuuchandiannepie.deviantart.com/art/Discolight-273099814

Update Plans
December 11 - Edited versions of first four chapters
December 14 - Chapter 5
Future updates at least 1 time per week.
Total Planned Chapters - 12

Discord is defeated and petrified in his stone prision, When Celestia remembers how he used to be, she unintentally wishes upon the stars themselves that he could have had a chance to show his true self.

In Equestria, wishes have a tendency to come true.

Now in an altered form, Discord must discover what role he is to play if he is to remain free and spread the joyous chaos he loves so...

In Equestria's far future, one thousand and five years after the return, a dysfunctional group of argumentative ponies must quest to defeat the most dangerous enemy of Equestria to ever live; the malevolent Lord Second, one of the only known members of the race of elder gods known as the humans, and the ancient cult who worships him, the Brotherhood of Man.

An over-the-top surrealist comedy, with slight serious elements. Expect a steady decline into insanity.

Cancelled, due to reasons of severe cranial trauma

Now with audio reading and prequel story, Shades of Grey, by Draven Eclipse.

After Princess Celestia's decision to banish her sister to the moon, she's come to realize that her power is diminishing. There is an unbalance of power and the Elements of Harmony are lost to her. Discord is her only hope to help put it right, but at a price.

Bowser's latest scheme to conquer the Mushroom Kingdom winds up sending him and his army into Equestria by mistake. Upon failing to conquer what he thought was Princess Peach's castle, he accidentally sets free a strange looking creature encased in stone.

What unfurls is an unusual adventure between the unlikely duo of a pony and koopa, out on a quest to save Equestria and all their friends from the grip of chaos.

Will Pinkie Pie save the day? Will Bowser come out on top this time? Will He be able to put up with Pinkie's over the top, hyperactive antics? Will She get through to the grouchy Bowser and make a new friend? You'll just have to find out for yourself.

This tale is super. It's bizarre. It's Bowser and Pinkie's Super Bizarre Saga!

What if Discord had defeated Twilight Sparkle and her friends? What if he was unimpeded in his neverending search for chaos and disorder? What if he ruled Equestria? How will the Mane 6 cope?

WHO CARES? It's not supposed to make sense! This story is all about Discord and the crazy chaos he oh-so-loves to spread! Watch as he makes Equestria his own. There will be many laughs to be had!

Twilight Sparkle has read about about what she believes may be an ancient library deep within the Everfree Forest called Ravenspire and, friends in tow, she heads out to find it. However what she finds inside this place is a creature, ancient beyond reckoning, desperately clinging to memories of a time long past when the kingdoms of Chaos ruled and all paid homage to the Ruinous Powers.

Added the human tag for way later. Like around the end, for like a thousand words.

Down voted by Commander Ponysun, so you know it's good!

Now with 100% more Rorschach!

Celestia takes a midnight stroll, and makes a rendezvous with an old foe.