You can draw upon a mythic reserve to resist nearly any disease, poison, or other grievous harm.
Benefit(s): Once per day, when you fail a Fortitude save, you may choose to replace your saving throw result with 20 + your total Fortitude save bonus (as if you had rolled a 20 on the d20 roll for your Fortitude save, though this does not count as an automatic success). You must make this decision immediately after discovering your initial Fortitude save failed. This benefit is in addition to (does not replace) the normal benefit of Improved Great Fortitude.
Mythic Options: The Missing Core Feats. © 2013, Owen K.C. Stephens; Author: Owen K.C. Stephens