Fiona lance, the sole survivor, partnered up with the morally questionable gun for hire known as Erin Graves, to find her missing brother.

I do not own this story, I was asked to put it up for those to read. All credit goes to Kkat from equestria daily. Set in an alternate future, one pony must learn to survive in a blasted, poisoned land...and possibly, with the aid of friends made along the way, bring new light into the darkness of post-apocalyptic Equestria.