Durham’s Tortuous Solitude

One creature that the caster can see within range is enveloped in a sphere of pure blackness. The sphere only encompasses the creature and no area around it. The target must make a Wisdom saving throw. If they fail this saving throw, then the creature suffers from blindness, deafness, and can no longer be heard nor seen by other creatures outside of the sphere. For each round that the creature remains encased in the sphere, they suffer 4d10 psychic damage. Alternatively, this spell can target up to three creatures that the caster can see within range and that are within 30 feet of each other. The targets attribute the same aforementioned conditions and must make Wisdom saving throws, but on a failed save each creature would take 2d10 psychic damage.

At the beginning of each of its turns, the creature(s) can repeat the Wisdom saving throw. If they succeed in this saving throw, then the spell ends.

If this spell is cast using a spell slot of 5th level or higher, then the damage dealt to the creature(s) in the sphere(s) increases by 1d10 for each level above 4th. Additionally, at 5th and 6th level, the caster can target up to four creatures, and at 7th, 8th, and 9th level, they can target up to five creatures.