Inner Fire

Your core body temperature increases when you are subject to cold-based spells and effects.

Prerequisite(s): Endurance, Great Fortitude.

Benefit(s): Whenever you succeed on a saving throw against a spell with the [cold descriptor], you gain resistance to cold equal to the level of the spell. You may immediately apply the resistance to any cold damage dealt by the spell responsible for triggering this feat, and the resistance to cold lasts for a number of rounds equal to your Constitution modifier (minimum 1).

In order to gain resistance to cold, the saving throw must be made in response to an enemy’s actions.

Saving throws caused by your actions or those of your allies never grant resistance to cold.