"Many changelings are not evil but hungry but not all are even born changelings, when a pony is trapped inside a changeling cocoon their bones are stretched out, cut, or just destroyed in some other manner. But painful morphing isn't the only way a pony can become a changeling, if high amounts of magic is focused into the body at right amounts it can morph a ponies body. This is why we need to go find him" celestia urgently stated "Is that why you gathered us all here?" twilight questioned as she looked around the room of her friends all being there with her "Do we really have to go?" fluttershy whimpered "Is this changeling some large monster?!" rainbow asked excitedly.