You create a layer of ice on your hands that strenghten your hits. Once a round you can make an unarmed strike and add 1d4 cold damage to the attack. Instead you can also make an unarmed strike and add 1d8+Spellcasting mod cold damage, but doing this breaks and shatters the ice and the spell is dispelled.

You can cast this spell with a 3rd lvl spell slot and doing so adds an extra d4 or d8 cold damage, every level higher spell slot also adds a d4 or a d8.