You gain an additional benefit when you reach 10th level in this class.
Tireless
As an action, you can give yourself a number of temporary hit points equal to 1d8 + your Wisdom modifier (minimum of 1 temporary hit point). You can use this action a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.
In addition, whenever you finish a short rest, your exhaustion level, if any, is decreased by 1.