Song by Slyphstorm: http://youtu.be/BhtrnNzWTOw
Art by Izeer: http://izeer.deviantart.com/art/King-Sombra-Wallpaper-338018982
Check them out!

Featured on:
PMVtoday: http://pmvtoday.com/2014/04/through-sombras-door-by-idhrenlives/
EQD, #5: http://www.equestriadaily.com/2014/04/simple-pmv-compilation-78.html

All the video is from the show My Little Pony: Friendship is Magic
Episodes used:
Season 3, Episodes 1 & 2 (The Crystal Empire)

Video can be removed upon request from authoritative sources.