Archives of Nethys

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Endurance

Source PRPG Core Rulebook pg. 122 (Amazon)
Harsh conditions or long exertions do not easily tire you.

Benefit: You gain a +4 bonus on the following checks and saves: Swim checks made to resist nonlethal damage from exhaustion; 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.

You may sleep in light or medium armor without becoming fatigued.

Normal: A character without this feat who sleeps in medium or heavier armor is fatigued the next day.

Mythic Endurance

Source Mythic Adventures pg. 65 (Amazon)
Your endurance is truly beyond the pale.

Prerequisites: Endurance.

Benefit: The bonus on checks and saves from Endurance increases by half your tier. You take half the damage when you fail a check to avoid nonlethal damage from a forced march, starvation and thirst, hot or cold environments, or slow suffocation.

You can sleep in heavy armor without becoming fatigued.