When your health goes below 1, you fall unconscious. Whilst under 1hp, roll death saves (d20). 1-10 is a fail, 11-20 is a success. 1 is two fails, 20 is two successes. If you fail 3 times, you die. If you succeed 3 times, you stabilise and will awake on your next turn. Your health can go into the negatives, and if you reach triple your health in the negatives you instantly die. If you are healed back up to positive health by your next turn, you awake and are no longer rolling death saves.