First mentioned in chapter 374 when Overwhelming Smile was announced to have conquered the Hard Mode of the dungeon.
Description[]
Bone Ruin is a Level 20 50-man Team dungeon located in the eastern region of the Star-Moon Kingdom. It is known as one of the Three Great Dungeons of Maple City. It has the same difficulties as other dungeons of Normal, Hard, and Hell Mode.
Overwhelming Smile was the first guild to complete the Hard Mode of the dungeon.