The Alchemist's Chemical Ball

You form a ball of pure physical chemicals in your hands and cast it to a point within range and then the ball bursts into toxic gas which then erupts into an explosion of elements. Each Creature within a 20-foot-radius sphere centered on that point must make a Constitution Saving Throw. The target takes 4d6 poison damage on a failed save, or half as much on a successful safe. then each creature must take a Dexterity Saving Throw. On a failed save the target takes 4d6 elemental damage of your choosing, and half as much on a successful one. If no element is selected, the base damage is 8d6 poison damage.

Possible base elements are Acid, Cold, Fire and Lightning if mixed with the appropriate supplements.
However, with prior experiments and experiences, an alchemist can use anything to alter the effects of the elemental damage, such as holy water for radiant damage. Discuss with your GM about possible ideas.

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.