Explode

If you cast implode on a enemy that has a CR of less than your intelligence stat and they didn't die, this spell deals 5d20 +20 force damage on them- and if this spell kills them, all creatures within 15 feet if they are size tiny, 30 if they are small, 40 if they are medium, 60 if they are large, 90 if they are huge, or 120 if they are gargantuan takes half the enemy's full HP rounded down in damage.