Aron's Iron Form

You touch a willing creature. Until the spell ends, the target's skin has a sterling, steel-like appearance, and the target's AC can't be less than 14, regardless of what kind of armor it is wearing.

Your own hands become as dense as weapons, and can be used as such. Your unarmed strikes deal 1d4 bludgeoning damage and you are proficient with your unarmed strikes. Finally, your unarmed  strikes are magic for the sake of damage resistances, and you can use your spell casting ability instead of strength.