My Little Pony: Friendship Is Magic

Season 8, Episode 22

Episode Title: What Lies Beneath

Air Date: 2018-09-22

Overview:

The students of Twilight's School of Friendship are cramming for "History of Magic in Equestria" exam in the school library when they discover a part of the school that no pony else knows about. When they decide to do some exploring they end up learning much more than they bargained for.