This spell creates a sphere centered on a point you choose within range. The sphere can have a radius up to 40 feet. The area within this sphere is filled with magical darkness and crushing gravitational force.
For the duration, the spells area is difficult terrain. A creature with darkvision can not see through the magical darkness, and non-magical light can not illuminate it. No sound can be created within or pass through the area. Any creature or object entirely inside the sphere is immune to thunder damage, and creatures are deafend while entirely inside it. Casting a spell that includes any verbal components is impossible there.
Any creature that enters the spells area for the first time on a turn or starts its turn there must make a Constitution saving throw. The creature takes 8*D10 force damage on a failed save, or half as much damage on a successful one. 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 gray dust.
This is a Dunamancy spell and it should be discussed beforehand with your DM.