Final stand

Once per long rest. When you are knocked unconscious and are rolling death saving throws, on your turn Before you roll your death saving throw you can instead pick yourself up off the ground and join back in the fight. You heal yourself for 2d10 plus your constitution modifier you also suffer 1 point of exhaustion instantly upon getting back up. This ability does not work on spells or attacks that will render the user instantly dead such as natural 20 from a vorpal longsword that will instantly decapitate you. This ability also scales when you level up at 5th level it turns into 3d10 at 10th it is 4d10 15th it is 5d10 and at 20th it is 6d10