One player must always play the role of the Overseer. All remaining players must play four hero characters. If there are not enough players, a single player may control more than one hero.
The Overseer controls the Catacomb Lord and monsters who inhabit the catacomb. As Overseer, you set the pace and tone of the game. Although you’re trying to win by defeating all the heroes, you will also want to make the game enjoyable for the other players.