Leonidas and Sibella Casterwill-Lambert. The children of Lok Lambert, Champion of Casterwill, and Sophie Casterwill, head of the Casterwill family. The two of them were renowned seekers in their generation. While on a mission together, they discover the world full of mysteries that are yet to be discovered. How will Equestria fair with these twins on the scene? (Not the best description, but I digress.)