WARNING: Possible spoilers (episodes 12 and 13).
I do not own any of the music or anime in this video. Claymore is owned by Norihiro Yagi and Madhouse. This video is fan-made and for entertainment purposes only.
The music is owned by Escape the Fate.
Song: Gorgeous Nightmare
Artist: Escape the Fate
Album: Escape the Fate (self-titled album).
Update: Wow! 1,000 views, I didn't know Ophelia was so popular. Thanks for the milestone guys! :D