Chaos Burst

A bright streak flashes from your pointing finger to a point you choose within range and then blossoms with a low roar into an explosion of instable chaotic energy. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 6d8 damage on a failed save, or half as much damage on a successful one.

The damage type is determined by the results of the d8, as indicated below. 

1- Acid, 2- Cold, 3- Fire, 4- Force, 5- Lightning, 6- Poison, 7- Psychic, 8- Thunder. 

If half of the d8 roll the same number, a chain reaction takes place, and every target in range must make a new Dexterity saving throw. The targets take an extra d8 damage on a failure, half on a success.

The blast spreads around corners.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd.