A Floor Boss (フロアボス, Furoa Bosu?), alternatively called a Labyrinth boss, is a type of boss that can only be encountered in a large room, called a boss room. A Floor Boss’s main purpose is to guard the entrance to the next floor, requiring players to defeat it to advance towards the 100th Floor. Each Floor Boss is a powerful creature, with several HP bars, that usually requires a raiding party to defeat and usually has special attack patterns. Some Floor Bosses also have minions that are constantly summoned throughout the battle to aid it in dealing with the players, though some bosses do not have minions at all.