Myst was an assassin working for a shady government agency, that is until she ended up as a pony in Equestria. Soon after arriving she discovers that this utopic place isn't really a utopia. Just beneath the surface there are ponies fighting and dying every day so that the heartland of Equestria can remain safe. Myst is pulled into this struggle fighting against the Isri, a race of large felines. Through her experiences she comes to value life in a way she never did before.