Winter Sparkle is an alicorn that is doesn't like to be called a princess. But she lives on Mount Everhoof in her mansion she had build herself from the forests that grow around there.

Master Chief awakens from his slumber in stasis and must defeat his old enemy again. During this he finds a strange looking pony that talks to him and helps him to defeat his enemy.

This story happen's before Fallout Equestria: Experiment XXXHell. This story is based around Sinon the companion and dear friend of the main character in Experiment XXXHell Emma.