This story is a sequel to Hard Reset

After the events of Hard Reset Twilight's life and mental well being are slowly returning to normal. Her recovery is cut short, though, when a letter arrives informing her that the time loop spell she cast is causing severe damage to space and time itself. In over her head, Twilight tries to summon anypony who will know how to fix it. The pony she gets is the last one she ever thought she would meet... and nothing like she expected him to be.

Available in Spanish thanks to dgs1993
Series TV Tropes page

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

An exiled changeling. Completely cut off from the Hive and left to wander Equestria to die. But death doesn't greet him. Instead a new life in Ponyville, hidden from the town residents by Vinyl Scratch, Octavia, and the CMC. But why was he exiled? Why did he instinctively wander towards Ponyville?

Dithyl and Keyser. Two changeling friends of the changeling from before his exile set out in their own self-exile to find their friend.