Troubled author Inkwell is not only one of Equestria's only horror writers, but also a stallion without a cutie mark. He has amassed a loyal following of readers, including Princess Luna herself. One day, in order to help him overcome his writer's block, Luna invites him to the castle's restricted library to find inspiration. In the darkest corners of this library, Inkwell uncovers an ancient secret that is unknown even to the two princesses. Soon, he finds himself plagued with horrific nightmares which he uses as the subject of his book, and things become complicated when these nightmares begin to manifest themselves in the real world. Can Inkwell and Luna stop what they've unleashed before it's too late?

Based off various works by H.P. Lovecraft.