Discord gets free during Nightmare Moon's return, helps save equestria, and makes a chaotic ripple in everyone's lives. All he, and many others, can ask is "What Now?"

Instead of being absorbed by Tirek, Discord's magic shoots away and goes to the last pony anyone expected: Celestia. Now Equestria must cope with thier most experienced leader being a bit...stranger

After getting letters from Celestia and Discord, Cadence decides to give a happy ending to an ancient tragedy of love. Unfortunately for her, this is the Lord of Chaos and Princess of the Sun. Also, Flurry Heart explained.

Twilight discovers she is an old soul, having lived many times yet getting further and improving the world each time. Now an alicorn, she has new options to explore: including remembering, but at a cost. Luckily, Discord is there to help her.

OC and story created through Birthday Scenario Games: Princess Celestia couldn't be happier. The elements are restored, her sister has returned to her, and her alicorn son has returned home....wait, what?

The ponies are use to living with what are basically gods: The Alicorns of the Sun and Moon, a newly ascended unicorn, and even a chimeric lord of chaos. The Tree of Harmony suddenly having a mobile form? That will take some time, on both sides.

Nightmare Moon won. Which isn't too bad since she's merciful(er than expected), is willing and wanting to learn of this new era, and is willing to compromise the "Eternal Night" plan if she can't make it work.

A bus worth of children reborn into Equestria's world, all of them changed and most not into ponies. A decade later, they regather in Ponyville after Nightmare Moon's return/defeat. LOTS of OCs as varied creatures, meeting canon characters.

In his statue, Discord got bored and played god. Now that he is 'reformed', the princesses and mane six(and Spike) get to see the fruits of his labors. It is amazingly less terrifying than expected. Pre-Alicorn Twilight and Armored Alicorn Sisters