Hi there, I am trying to add the damage for the spell "Witch Bolt" in the Attacks & Spellcasting area of my character sheet. But I don't know how write it so the number of d12 rolled based on the level the spell is cast at. Can someone help me? It's supposed to do 1d12 + an additional d12 for each slot level above first. So 2nd Level would be 2d12, 3rd level would be 3d12 and so on.