pinkie was missing for years, one by one twilight's friends were defeated one by one. only she and Fluttershy remain to find her, but the occult had summoned something a lot earlier than Cthulhu, and that something is whom she figured out who it was. and that thing knew twilight all too well.

this story is based on the Cthulhu mythos and hp Lovecraft's poems, and it's also based on a short film called miner's mountain. Click the link here