Blood God's Smite

When you cast the spell, choose a point you can see. A bolt of red lightning strikes that point. Each creature within 5 feet of that point must make a Dexterity saving throw. A creature takes 4d10 lightning damage on a failed save, or half as much damage on a successful one. 

At Higher Levels. When you cast this spell using a spell slot of 4th or higher level, the damage increases by 1d10 for each slot level above 3rd. Each higher spell level requires an additional pint of blood.