Luna kicked herself as she thought about how it would be possible. The crystal ponies of Caverndown had used a secret way to escape to Mareitania from the Crystal Empire during King Sombra's reign a thousand years ago. Nopony knew where the hidden way was anymore, but there was one pony who might; the alicorn Faust. They hadn't been surveying northern Mareitania for mining opportunities, they'd been searching for the tunnels!