Ebaria Epic Boon: Apex of Vitality

You gain maximum hit points equal to your strength and dexterity scores combined.

When you drop to zero hit points, you may expend all of your hit die, heal for that amount (adding con modifier for each hit die expended).

Your maximum hit points can’t be reduced, and your hit dice are treated as if you rolled the maximum amount while levelling up, instead of the average amount. When you heal yourself while you are above zero hit points, that healing cannot be negated.