Dethball

A dark streak flashes from your pointing finger to a point you choose within range and then blossoms with a low roar into an explosion of  smoke . Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 8d6 necrotic damage on a failed save, or half as much damage on a successful one.

The smoke spreads around corners.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd. When you cast it as a 5th level spell you may use an extra spell slot if you choose to then for every target that failed the save and got killed by the spell there is a 40% chance that they become a skeleton under your control.