You have a connection to the Abyss that allows you to emulate demons and their savage fighting, granting you the following benefits:
• Increase your Strength, Dexterity, or Constitution score by 1, up to a maximum of 20.
• As a bonus action, you can adopt a more demonic form. For 1 minute, you manifest a natural weapon (such as claws, fangs, or horns) that you are proficient with. It counts as a simple melee weapon for you, and you add your Strength or Dexterity modifier (choose when you gain this feat) to the attack and damage rolls when you attack with it, and it deals 1d8 bludgeoning, piercing, or slashing damage on a hit (choose when you gain this feat). 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.
• When you take cold, fire, lightning, or poison damage, you can use your reaction to give yourself resistance to that instance of damage. After you use this reaction, you can’t do so again until you finish a long rest.