Durable
Source: Player's Handbook
Prerequisite: Level 4+
You gain the following benefits.
Ability Score Increase. Increase your Constitution score by 1, to a maximum of 20.
Defy Death. You have Advantage on Death Saving Throws.
Speedy Recovery. As a Bonus Action, you can expend one of your Hit Point Dice, roll the die, and regain a number of Hit Points equal to the roll.