Simple die

Rolling a simple die refers to a method of the Ars Magica game mechanics to determine the quality or the outcome of an action or event by involving a random factor. You roll a single ten-sided die, and read the unmodified number as the result of the roll. On dice labeled 0-9 instead of 1-10, a zero counts as 10.

As far as actions are concerned, a simple die is usually employed to reflect a situation where a character is relaxed. For stressful situations, a stress die is used.