The Hollow Bone (Japanese: 巨神の環状骨, Kyoshin no kanjō-kotsu, lit. Giant god's annular bone) is a landmark in Xenoblade Chronicles. It is located on the upper level of Valak Mountain, in Bagnar Snowfield, on the northwest end of the map. Nopon Researchers can be found here. There is an ice slide in the cliff here that is presumably the Hollow Bone. It leads down to a small lake and then the Nopon Camp, with some more Nopon Researchers. Some quests are received both at the top and the bottom. If the party leader jumps at the right times on the slide, they will be able to access the Antol Den.