Diamond's Fist

 You make a melee, unarmed attack. This attack deals 5 radiant damage plus your regular Unarmed damage. You then roll another attack, this time at advantage, for again unarmed damage plus 5 radiant damage.

At higher levels: If you cast this spell with a spell slot of level 3 or higher, the added Radiant damage increases by 5 for each slot level above 2nd.