UPDATE: Four chapters and the story is finally completed! Check out the end of this long description to see which chapters are left.
Arc IV - Chapter II - "Zero (Part 2)" (WIP)
Stone Chisel, one of the most notorious robbers of recent times, is finally caught in the Everfree Forest while trying to perform a spell to escape. Once he gets locked up in Tartarus, denying various offers that could give him an opportunity to start again, he finds out something that will not only change his life but also will make him commit the biggest mistake... setting free something... not so good.

This story happens during the Beginning of the End of Season 9, but in an alternate universe where something happened with the Great Galloping Gala and Crystal Faire (If you wanna know, keep reading!), and Flash Sentry is a unicorn.

Rated T because of violence, gore, death, and mild profanity. WARNING! SPOILERS IN THE COMMENTS!

More tags:
Princess Celestia
Princess Luna
Discord
Shining Armor
Princess Cadence
Starlight Glimmer
Flash Sentry
Flurry Heart
King Sombra
Grogar

CHAPTERS LEFT:
Arc IV - Chapter III - Zero (Part 2)
Arc IV - Chapter IV - Day of the Fallen
Arc IV - Chapter V - Privately
Arc IV - Chapter VI - Bye