Alastor´s ball of weirdness

You conjure a mass of chaotic magic gathered randomly and haphazardly from the different planes on a location you can see.

Each creature in a 1d4x10-foot-radius sphere centred on that point must make a Dexterity saving throw. A target takes (2d6)d6 damage on a failed save, or half as much damage on a successful one.

The type of damage is determined randomly (1d6):

1 fire

2 cold

3 poison

4 force

5 necrotic

6 acid

The explosion 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.