Fists of Iron

Transmutation cantrip

Casting Time: 1 bonus action

Range: Self

Components: V, S

Duration: 1 minute

Your fists becomes as hard as iron. For the duration, you can use your spellcasting modifier instead of Strength for the attack and damage rolls of melee attacks using your unarmed strike, and your unarmed strike’s damage die becomes a d8 except when you make one using a bonus action. Your unarmed strikes are treated as magical for the purpose of overcoming damage resistance and immunity. The spell ends if you cast it again or if you hold anything in your hand.