Original song by Slyphstorm: http://youtu.be/0zJk57IpHrs
Original thumbnail art by Huussii: http://huussii.deviantart.com/
Check them out!

Featured on:
PMVtoday: http://pmvtoday.com/2014/04/castle-of-shadows-by-idhrenlives/
EQD, #2: http://www.equestriadaily.com/2014/04/simple-pmv-compilation-78.html

EDIT: 4/26/2014 1,000 views in 3 weeks! Thank you all!

It's been a few years since I tried something like this, so please forgive the irregularities and problems (but do let me know about them).

All the video is from the show My Little Pony: Friendship is Magic.
Episodes used:
Season 1 Episode 1 (The Mare in the Moon)
Season 1 Episode 2 (The Elements of Harmony)
Season 4 Episode 3 (Castle Mane-ia)
Season 4 Episode 1-2 (Princess Twilight Sparkle)

All the video is property of Hasbro, I can remove this music video upon request.