LITTLE KNOWN FACTS ABOUT D20.

When an quantity is usually to be subtracted, the notation is nds-c or nDs-c; so 3d6-4 instructs the participant to subtract 4 from the result of rolling 3d6. If the results of a modified dice roll is negative, it is usually taken for being zero or just one; As an illustration, in the event the dice roll determines the level of harm to a creature.[