What happens when a pony doesn't actually like the cutie mark that they receive? Perhaps one more embarrassing than most? Well, that's when Starlight Glimmer's special talents come into play.
After freakish happenstance turns Lyra Heartstrings and Queen Chrysalis into a symbiotic being, they find themselves putting their superpowers to heroic use in an ever-changing Equestria.
Sequel to The Celestia Code. When the monsters created by the dark crystal engine escape their prison, it's up to Princess Twilight to deal with them. She gets help and advice from Princess Luna, but things don't go as planned.