Regenerative

You gain the ability to regenerate very quickly, gaining the following benefits/traits:

Ability Score Increase. You increase your constitution modifier by 1, to a maximum of 20.

Regeneration. As a bonus action, you can use one of your hit dice to heal yourself. Roll one hit dice and add your constitution modifier, with the total being the number of hit points you regain. Additionally, you now regain half of your spent hit dice on a short rest.

Fire and Acid Weakness. If you take fire or acid damage you can not use your regeneration ability until the next round. If you are resistant, immune, or absorbant to fire and/or acid damage this trait does not apply for that damage type.