Entropy

You unleash the innate magical energy contained in souls. All creatures within an 80-feet radius from you must immediately make a Constitution saving throw. On a failed save, they take 10d4 force damage and an extra amount of d4s dependent on the amount of spell slots you have remaining, adding 1d4 for the level of each spell slot. For example, if when the spell is cast, you have 3 1st level spell slots and 2 4th level spell slots, the spell would deal 21d4 force damage (10d4 base damage, 3d4 from 1st level spell slots and 8d4 from 4th level spell slots). On a successful save, the creature takes half damage and is pushed out of the radius of the sphere. The caster always takes the full damage of the spell, which cannot be reduced in any way.

After the spell is cast, a pitch-black void envelops the area affected by of the spell. It behaves like a permanently stationary sphere of annihilation, and it can only be destroyed by no means short of a wish spell, which sacrifices the soul of the caster.

A creature who is killed by the initial explosion or the remaining effect has its soul is destroyed.