My entry for contest!While drawing this I was thinking: wouldn't it be cool if Tirek was the one behind Nightmare Moon?He would have been a great manipulator, not unlike Discord but with the ability to steal and manipulate dark magic, and his whole plan was to use one of the very pillars of Equestria to disrupt harmony and spread evilness though its lands and corrupt the enormous amount of magic the little ponies posses. In the end thought, Celestia did what she had to do, and even managed to find out about Tirek, yet she never managed to find and him.And then, in present, he will manage to complete his masterpiece! The elements of chaos! And instead of shooting rainbows they will fire (you guessed it) the rainbow of darkness! Which are capable of doing lots of very unnice things, among which free a not reformed Spirit of Disharmony with a little angst against certain ponies.