Pyromancer's Gauntlet

These gauntlets have 10 charges. While wearing
these gauntlets, you have resistance from fire
damage. Additionally, you can use a bonus action
to expend a charge and activate the gauntlets for
1 minute. While activated, whenever you roll
fire damage on your turn, the roll gains a +2
bonus to the damage it deals on a hit. Whenever
you are hit with fire damage, the gauntlets regain
a number of expended charges equal to half the
damage taken, rounded down.