Everyone except one pony is dead. Unfortunately for that pony, there are spooksters afoot. This is dumb and I should be ashamed of myself. Also the pony is a dragon.
One Thousand years ago, the saints Celestia and Luna drew upon the power of the Red Stone of Aja to defeat the demon Discord. Now one thousand years later the Stone is destroyed, beginning the tale of six ponies and their quest to redeem the world.