Flash- a pegasus pony with no memory of herself, her past, or even what happened suddenly finds herself thrown into the middle of the Equestrian WasteLand. Almost immediately she finds herself in one big heap of trouble, and continues to fall farther and farther into the darkness of her new home. As she struggles to survive in her new environment, she runs into people she never thought she would- namely, a trigger happy mercenary who she somehow managed to owe a hefty debt to, and has to work to repay it. She finds herself in his unwanted company, and the company of others the two meet along the way.
Whilst searching for who she really is, and her own past- she begins to think she may not like what she finds about who she used to be, what she used to do- and starts wondering if she wants to be the pony she used to be at all. Wrapped up in her own searching, there are several ancient powers beginning to fester in the Land, several creatures and nearly forgotten histories of the Old World that have never reared their heads until recently- things nopony even dreamed.
For some reason- everything seems to revolve around Flash, her lost memory- the memories that could save the WasteLand from being destroyed in the magical fire of one of Equestria's greatest enemies, that has slept for centuries now. An ancient evil that threatens the lives of everypony she knows, and maybe even the ones she knew (or at least, thought she knew..)- and she's the only one that has a chance of figuring out how to stop darkness from falling. Lucky her, huh?