Die Hard

Your battle-hardened body recovers more quickly than others. You gain the following benefits:

• Increase your Constitution score by 1.
• You have advantage on death saving throws.
• When you have fewer than half your hit points remaining, you can use a bonus action to expend two of your Hit Dice and roll them, regaining hit points as if you had experienced a short rest. You can use this feature a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest. Hit dice expended are regained normally, through long rests