This is just my take on the Crystal Empire and its history. It includes who ruled before the fall of the empire, the reason for the fall, the banishing of Sombra and from there it's mostly headcanon. But I hope this catches your interest and perhaps you might accept my headcanon? ^.^ Maybe? Either way, please enjoy!

[size=0.75em]Credit for headcanon idea: ConspiraPon3[/size] https://www.youtube.com/channel/UCBn74HiMEjMb25G7L8Gs_gQ
Credit for the cover art: Huussii on DeviantArt http://huussii.deviantart.com/art/The-Unsung-End-362486615