Set in a dark fantasy world, players take control of a hero who has journeyed to the fictional kingdom of Boletaria, which is being ravaged by a cursed fog that brings forth demons who feast on the souls of mortals. The game has been described as a spiritual successor to the King's Field series of games. The gameplay involves a character-creation system and emphasizes gathering loot through combat with enemies in a non-linear series of varied locations. It has a unique online multiplayer system integrated into the single-player where players can leave useful messages and warnings for other players' single-player game worlds, as well as joining other players in their world to assist and/or kill them.