Tiny Onyx Star

This spell creates a sphere centered on a point you choose within range. The sphere can have a radius of up to 30 feet. The area within this sphere is filled with magical darkness and crushing gravitational force.

For the duration, the area is difficult terrain. It is magical darkness and nonmagical light can't illuminate it. The spell's area is silent, thus any creature inside the sphere is deafened.

Any creature that enters the spell's area for the first time on a turn or starts its turn there must make a CON saving throw. The creature takes 8d10 force damage on a failed save. On a successful save this is halved. A creature reduced to 0 hit points by this damage is disintegrated. A disintegrated creature and everything it is wearing and carrying, except magic items, are reduced to a pile of fine gray dust.