Undying Resolve

Your eyes blacken & glow like burning coal. Your body becomes engulfed in an aura of shadows that flicker like a flame. Burning passion keeps you fighting despite your grievous wounds. If you drop to 0 Hit Points & don't die outright, you can make a Constitution saving throw equal to 10 or half the damage you take, whichever number is higher. If you succeed, you drop to 1 Hit Point instead & enter a state of burning resolve. While in this state, you gain the following benefits:

•You have advantage on skill checks & saving throws.
•When you make a Melee Weapon or Melee Spell Attack, you may change the damage type to fire damage.
•You gain Immunity to fire damage & Resistance to cold damage.

This feature lasts for 1 minute & ends early if you are knocked Unconscious. Once you use this feature, you suffer one level of Exhaustion.