You can draw upon an inner reserve to resist diseases, poisons, and other grievous harm.
Prerequisites: Great Fortitude.
Benefit: Once per day, you may reroll a Fortitude save. You must decide to use this ability before the results are revealed. You must take the second roll, even if it is worse.
Pathfinder RPG Core Rulebook. Copyright 2009, Paizo Publishing, LLC; Author: Jason Bulmahn, based on material by Jonathan Tweet, Monte Cook, and Skip Williams.