We didn't go too far in, so I only saw trees. But according to the map, there's a lake, a forest, caves, some open area? What I sensed was deeper in, but I'm not sure exactly where. The inmates there are pretty dangerous. Even the plants can be dangerous. We should be prepared for anything.
[Who to bring?]
U-umm.... [He only has one friend, Percy.] Maybe Yuuri? Or ... I met this guy Kanji. He's pretty cool...