Book Two of Tales of an Equestrian Battle Mage.

Sunset, feeling herself betrayed by her Princess, escapes through Starswirl's portal to the Realm of Men. Concerned for her safety, her battle sister Aiko follows her through. Nothing however goes as planned. The forces of darkness have gathered, and see a chance to land a decisive blow against Harmony, striking down her agents as they pass through the chaotic realms.

And Sunset is left to deal with what remains, her sister at her side, in a Realm so different from anything they expected and no way back for now.