Caustic bolt

Caustic

60 ft range, concentration

Choose a point within range. A 5ftx5ft ball of acid appears there. Creatures in the area, as well as creatures that enter the area for the first time on a turn, or end their turn there take 4d6 damage acid (CON save for half) add 2d6 for every spell slot higher then 6

As a reaction, you can end the spell. When you do, all creatures within a 15ft radius of the sphere take 6d8 acid damage (CON save for half). The ball explodes if you lose concentration as well.