Axolotl Regeneration

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

• Whenever you take damage in combat, you can use your reaction and 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). You can use this trait a number of times equal to your proficiency bonus, and you regain all expended uses when you finish a long rest.