Young Flurry Heart has no interest at all in being a prim and proper princess, and would much rather have wild and dangerous adventures like her Aunt Twilight.
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.
Twilight sets out to learn more of the ways of the world, and soon decides that the whole planet is disorganized, insanely dangerous, and desperately needs to be fixed. And she's just the mare to do it... with a little help from her friends.
After the events of Project: Sunflower, Erin returns to Ponyville to study magic. Meanwhile, something is stirring on the newly-discovered world of Harmony.
Four months after the end of human civilization, six ponies come together to rebuild. They learn that the apocalypse has not made friendship any easier.