Gift of the Fire Elemental

You’ve manifested some of the power of fire elementals, granting you the following benefits:

• You gain resistance to fire damage.
• When you take fire damage you can use your reaction to give yourself immunity to that instance of fire damage. 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 a creature touches you or hits you with a melee attack while within 5 feet of you, you can use your reaction to deal 1d10 damage to the creature. 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.