A roleplaying game rules system developed by the White Wolf Game Studio for use in its games, such as Vampire: The Masquerade and Aberrant.
The most salient feature of the Storyteller system is its simplicity. The outcome of events that are governed by skill and chance, such as trying to hit an opponent, is decided by rolling a number of ten-sided dice (also known as d10s). Typically, the number of dice rolled is determined by pairing a character's rating in an Attribute--the physical, mental, and social characteristics common to all people--with his rating in an appropriate Ability, a reflection of the talents, skills, or knowledges possessed by the character. If a certain amount of dice come up higher than a previously given difficulty, the action is considered successful.