Princess Celestia has been kidnapped! an elusive pair of ponies "The Shadow Twins" are holder her ransom, they want two magically powerful crowns that grant ultimate power. Can the mane 6 stop them and save the princess?

Authors note
MY FIRST FANFIC! so please don't judge TOO much. If you like it tell me and i'll try to finish it. Sorry for any grammar/spelling mistakes.
also, where it says "gore" basically there's just a few parts where people bleed and once someone dying is mentioned but that's all.
oyeah and, the cover art isnt all mine, original:
http://browse.deviantart.com/?qh=§ion=&global=1&q=mane+6+torn+photo#/d4iq56l
Credit to him.