The setting is in a medieval-fantasy world. There exists guilds and kingdoms in the surface (called 'overworld') comprised of many members from different races who come in different classes, like: mage, assassin, tank, cleric, and etc. They are hostile. Habitually, a group of adventurers will try to explore the dungeon, sometimes with their pet magical creatures. The dungeon master must do all in his abilities to drive them off.