This story is a sequel to Apple Bloom's Mansion 3: The Hotel of Eternal Rest
After a terrible battle, Apple Bloom finally captured Eternal Rest. But as she was captured, Eternal Rest opened a portal that transported Apple Bloom to another dimension, far from her family and her friends. What Eternal Rest didn't think, however, is that in this other dimension, Apple Bloom will find in her war against Thanatos a great help in the person of a certain prof.