Ability Score Increase. Increase your Constitution score by 1, to a maximum of 30.
Last Stand. When you would be reduced to 0 Hit Points, you can drop to 1 Hit Point instead and regain a number of Hit Points equal to half your Hit Point Maximum. Once you use this benefit, you can't use it again until you finish a Long Rest
Death Defiant. When you take damage while you have 0 Hit Points, you can make a death saving throw instead of suffering a death saving throw failure.