Twilight isn't having a very good day. An experimental spell blew up in her face, an army of changelings is attacking Canterlot, and she just died. Yet somehow, it looks like it's going to keep going downhill from here.

Given the chance to correct what's gone wrong, Twilight swears she's going to fix all this even if it kills her. Which it will. Frequently.

Cover art by Pixel Prism
Spanish Translation
Series TV Tropes page

The Cutie Mark Crusaders have always lived in the now, getting what they think needs to be done as a soon as possible, executing their plans just so they can move on to the next one right away, not thinking about the consequences till they’re right there in their faces. But when an attempt to earn their cutie marks goes too far, Sweetie Belle and her friends must face a horrible reality that sends their world into darkness and fear. How will the truth be uncovered and what will be sacrificed to undo this nightmare?