A group of cultists find a book detailing how they can finally summon 'their Lord' and they pounce on the opportunity to see the one who they have been praying to all this time. However, what they summon is possibly even worse than what they could've imagined.
Wrote this on a whim
Great story Nightmare Moon story. When I saw the human tag, I was expecting for a human to be brought to Equestria.