Endurance

Endurance (General)
You have incredible stamina.
Benefit: You gain a +4 bonus on the following checks and saving throws: 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 saving throws made to avoid nonlethal damage from hot or cold environments and Fortitude saving throws made to resist damage from suffocation. In addition, you may sleep in light or medium armour without becoming fatigued.
Normal: A character without this feat who sleeps in medium or heavier armour is automatically fatigued the next day.

Endurance

Glimpses of Hyboria Elfbane