Diamond mines

The "Diamond mines" were a set of locations featured within "Walk Tall, Act Fine, Never Look Back". The mines appeared to be a vast, not largely abandoned settlement set up by the Diamond Dog civilization. At one point, it was ruled over by the Master, the ruler of Diamond Dogs. The Mane Six traveled through the mines but faced a series of trials within them, such as being confronted by Jim the Cave Troll and being ambushed by a series of Changelings who disguised themselves as the ponies in order to cause upheaval. After the ponies left the mines, they headed within the Forest of Leota.