

Mettle
You roll a d20 and add your Mettle and Toughness modifier to the roll. If the total is higher than the Difficulty Check, you succeed. If it is lower, you fail.
Difficulty Check 7 (Very Easy)
Resisting the mild effects of a common cold or shrugging off a minor toxin.
Difficulty Check 12 (Easy)
Withstanding the discomfort from a mild poison or resisting the initial symptoms of a minor illness.
Difficulty Check 17 (Moderate)
Enduring the effects of a more potent poison or fighting off a serious infection.
Difficulty Check 22 (Hard)
Resisting a dangerous poison meant to incapacitate or overcoming the symptoms of a debilitating disease.
Difficulty Check 27 (Very Hard)
Surviving a lethal toxin that would incapacitate most beings or enduring the advanced stages of a deadly illness.
Difficulty Check 32 (Legendary)
Overcoming the effects of an extraordinarily powerful poison or disease, known to be nearly impossible to survive.