Trixie Lulamoon investigates the mysterious and gruesome death of her grandfather Star Tome Lulamoon and in doing so learns just how deep the shadows in Equestria can be. Now dealing with things she can barely understand and with her mind fraying at the seems. She needs to put together the clues left by her late grandfather and pit her wills against an ancient evil.

This story is a crossover between My Little Pony: Friendship is Magic and Eternal Darkness: Sanity's Requiem
Thanks to my friend http://www.fimfiction.net/user/Phoenix+Avalon who helped this be readable.
And also big thanks to TorturedArtist745 and his list on the Eternal Darkness magic http://torturedartist745.deviantart.com/art/Complete-Guide-to-Eternal-Darkness-Runes-281864941