10th/MF: Primal Rage, Unending Fury
Your Primal Rage feature improves with your mastery. When you Rage, you become too angry to die. Literally.
You become immune to the Wounded condition. Additionally, if you were to take a lethal blow while Raging (such as taking enough damage to gain the Dying, or be outright killed from an effect), you ignore it and gain a level of the Exhausted condition. This Exhaustion cannot be mitigated by any means.
When you exit combat and/or your Rage ends, you fall Unconscious for 10 minutes / Swift Rest if you have any levels of exhaustion, or die when if your exhaustion exceeds the necessary threshold.