Discord is widely believed by the public to have been the one and only God of Chaos. Celestia believes that Twilight is ready for the truth after ascending to alicornhood. The original God of Chaos was a human, and pushed the world to the brink of annihilation in his quest to force the evolution of the sentient races.
Not bad, although this clearly screams a sequel.
10175926
Honestly, I wrote this as a one-off with no intention of coming back to it since I was stuck thinking about chaos magic and Discord.
10666189
Honestly, I completely forgot I read this.
Re-reading it though, I wouldn't say it "screams" a sequel. I can definitely see this as an introduction to a larger story though. This is still a good one-off though!