Updated Saving Throw Mechanic:
Characters will frequently face deadly challenges with nothing but sheer luck and resourcefulness to turn to. Almost any calamity the character might be subject to not otherwise subject to some other die roll allows a Saving Throw or Save. To make this check, roll 1d20 and add the character’s HD and a flat bonus of +5. If the result is 20 or higher, the character successfully avoids or mitigates the danger, as adjudicated by the referee. Depending on the circumstances, the referee may assign additional bonuses or penalties to the roll.