Deep Ridge is a secret facility run by Nightshade Industries located to the southwest of Blue Nova. Its primary purpose was for secret experimentation, but it also became the prison of several equines who could not be allowed freedom, including the parents of the 12 Xonan foals, as well as pilots who were captured while Nightshade sought out a suitable ship for its ultimate weapon. Floydien and Simon were among those who was captured, which led to their "augmentation" with mana-conducting antlers and Tesla coils before they managed to escape.
After Belle escaped from Nightshade Tower in a hovercraft, she went to Deep Ridge with the intent of freeing the parents of the Xonan foals she had rescued. Upon arrival, she found that the facility's staff had already fled, leaving the former prisoners freed but starving.