Needs review
Source: Player's Handbook

Description: You are capable of amazing feats of stamina.

Prerequisites: ,\sNone

Required for: Diehard, Epic Endurance, Epic Spellfire Wielder, Expert Swimmer, Remain Conscious, Strong Stomach

You gain a +4 bonus on the following checks and saves: Swim checks made to resist nonlethal damage, Constitution checks made to continue running, Constitution checks made to avoid nonlethal damage from a forced march, Constitution checks made to hold your breath, Constitution checks made to avoid nonlethal damage from starvation or thirst, Fortitude saves made to avoid nonlethal damage from hot or cold environments, and Fortitude saves made to resist damage from suffocation. Also, you may sleep in light or medium armor without becoming fatigued.