You use essence to empower your fortitude.
Prerequisites
Constitution 13 or veilweaver level 1.
Benefit
You can invest essence into this feat.
You gain an insight bonus equal to the invested essence on all Fortitude saving throws.
You gain 1 point of essence.
Special
Empyrean Fortitude can be used in place of the Great Fortitude feat to qualify for a feat, prestige class, or other special ability.