Acidic Annihilation

You open a portal to the astral plane and pull a shimmering bubble of slime from a blob of annihilation. The bubble explodes, coating everything in a 20 ft. sphere with starry purple goo. Enemies in the area must make a Constitution saving throw, taking 5d6 Acid damage on a failed save and half as much on a successful one.

The area also becomes difficult terrain for the duration. When a creature moves into or within the area, it takes 1d6 acid damage for every 5 feet of movement it travels.

At Higher Levels. The damage of the explosion increases by 1d6 for each spell slot above 5.