Inner Flame

Your elemental nature has strengthened, drawing out your inner flame. You gain resistance to cold damage. Additionally, you can use either of the following abilities a total amount of times equal to half of your proficiency bonus (rounded down), regaining all uses when you finish a long rest:

-Whenever you take damage from a melee attack you can cause your body to erupt with flames as a reaction. The attacking creature must make a dexterity saving throw against a DC equal to 8 + your proficiency bonus + your constitution modifier. On a failed save, they take fire damage equal to your level.

-Whenever you hit a creature with an unarmed strike, you can cause your body to erupt in flames that cover your fists, as well as any other part of your body that you use to make unarmed strikes. The unarmed strike deals an additional d4 fire damage. Until the end of your turn, whenever you hit with an unarmed strike, it deals an extra d4 fire damage.