Darkfire

You create a mote of radiant energy encased in darkness and hurl it at a creature you can see. Make a ranged spell attack against that creature and on a hit, it takes 1d4 Radiant damage and 1d4 Necrotic damage. You can then choose to gain the Radiant damage as temporary hit points or make the creature subtract the Necrotic damage from their next damage roll. Each of these effects can only last till the start of your next turn.