Gamemaster
Referee: In most Tabletop RPGs, the rules are supplied to sort out arguments (avoiding the "Bang! you're dead!"/"No, you missed!" problem of playing without any rules). The GM is expected to make a decision when the rules are unclear in or do not cover a certain event. The GM may also allow or make "House Rules" to cover such events or to make the game play differently than with just the normal rules. As the gamemaster is often seen as being in charge of their gaming group, they might also be expected to solve arguments that are not to do with the game's rules.