Troll-blood

You have the blood of trolls flowing through your veins. You gain the following benefits:

• Increase your Constitution score by 1, to a maximum of 20.
• On your turn, you can take a Bonus action and can spend one Hit Die to heal yourself. Roll the die, add your Constitution modifier and regain a number of hit points equal to the total (minimum of 1).
• This ability does not work for 1 round any time you take acid or fire damage.