Dying

When a player character drops to 0 Hit Points, that character has the Dying condition, which replaces the following rules in the 2014 Player’s Handbook (page 197): “Falling Unconscious,” “Death Saving Throws,” and “Stabilizing a Creature.”
While Dying, you experience the following effects:

• 0 Hit Points. You have 0 Hit Points. If you regain any Hit Points while Dying, this condition ends on you.
• Knocked Out. You have the Unconcious condition.
• Death Saving Throws. At the start of each of your turns, you must make a death saving throw, a special save that isn’t tied to any ability score. You’re in the hands of fate now; roll a d20. If the roll is 10 or higher, you succeed. Otherwise, you fail. A success or failure has no effect by itself. The successes and failures also don’t need to be consecutive; keep track of both until you collect three of a kind, the effects of which are described below. When this condition ends on you, reset the number of success and failures to zero.
• Rolling a 1 or 20. When you make a death save and roll a 1 on the d20, it counts as two failures. If you roll a 20, you regain 1 Hit Point.
• Three Failures. On your third failure, you die.
• Three Successes. On your third success, you regain 1 Hit Point. This condition ends on you as normal, but you are still Unconcious andstart a Short Rest. You remain Unconcious until you regain any Hit Points or until another creature uses an action to administer first aid to you, which requires a successful DC 10 Wisdom (Medicine) check.
• Damage. If you take any damage, you suffer one death saving throw failure. If you suffer a critical hit, you instead suffer two death saving throw failures.