Twas a normal day in Ponyville, the sun was shining, the birds were singing, and all was normal. Well except for Twilight Sparkle on the verge of a major freak out. Checking her math time and time again, the calculations never added up, Tirek should have been harder to defeat that he was. So why was he defeated so easily?
Story occurs immediately post season 4, so that is the source of the Alt. Universe tag
Description does not match the quality of the story. (Meaning I'm horrible at making descriptions.)
Chapters (1)
Well, Tirek wasn't that much stronger than Discord when he took his magic, given his equality with the princesses combined, and Discord is about twice as powerful as Celestia alone. So a 2X superiority in power equals a one-shot.