Power of the Iron Golem

You have developed traits similar to those possessed by an iron golem, granting you the following benefits:

Ability Score Increase. Increase your Strength or Constitution by 1, to a maximum of 20.

Fire Resistance. You gain resistance to fire damage.

Fire Absorption. When you are subjected to fire damage, you can use your reaction to give yourself immunity to that instance of fire damage. When you take this reaction you regain a number of hit points equal to either the fire damage dealt or your level, whichever is lower. 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.

Poison Breath. As an action, you can exhale poisonous gas in a 15-foot cone. Each creature in that area must make a Constitution saving throw (DC 8 + your proficiency bonus + your Constitution modifier). On a failed save, the creature takes 5d8 poison damage, or half as much damage on a successful one. Once you use this feature you can't use it again until you finish a short or long rest.