Dug, a changeling who is just one of the many changelings who became a slave after the attack on Canterlot. A treaty sighed by the Queen and the Princesses. To use the have a a secondary prison, giving the changelings a food source. In return, the Queen would hand over a hand full of eggs for study and the integration of changelings into the normal day of ponies. In hopes of ponies and changelings living in peace, side by side. But things didn't go as planned and the changelings were made to slaves.