Arcane Fist

Your fists become imbued with magic. Choose one of the following damage types: fire, cold, lightning, thunder, force, acid, radiant, or necrotic. make an unarmed strike using your spellcasting ability for the attack and damage rolls. If the attack hits, deal an extra 2d6 damage of the chosen type.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by an extra 1d6, for each slot above 2nd.