GM

The GM, also called a Game Master, or Dungeon Master as called in some games is the voice of the game. They are a neutral person who runs the game. They set up the adventures for players, and act out the various characters that the players run into. They also play the monsters, and do the various dice rolls to see what happens to the character. They also do narration of the game. The Game Master is essential to the game, and to be a good Game Master the person needs to be fair, impartial and not cheat.