Burning the Candle at Both Ends

Adventurers often disregard grievous injury to continue fighting at the expense of their future well-being. You gain the following benefits:

• Increase your Constitution score by 1, to a maximum of 20.
• If you would fall to 0 hit points or die, instead, you may permanently mark a death saving throw as failed and your hit points become equal to 1/3 your total health rounded up. If all death saving throws are marked as failed then your character dies and cannot be resurrected outside of divine intervention.
• If a death save is marked as failed by this ability then you require that many less successful death saving throws in order to stabilize.