Definition of Game Master

The Game Master (GM for short) is the narrator and controller of the game world.

Definition of In-Character

Actions taken by a character rather than the player.

Definition of nDs

The formula representing how many of what type of die to roll (n dice with s sides). For example, 2D6 means a roll of 2 six-sided dice.

Definition of Non-Playable Character

A character played and controlled by the Game Master instead of by the players.

Definition of Out-of-Character

Actions and dialog taken by the player but not the character.