Affliction of Thickness

You create a burst of thunderous sound that can be heard up to 100 feet away when using a movement action. Each creature within range, other than you, must succeed on a Constitution saving throw or take 1d6 thunder damage.

The spell’s damage increases by 1d6 when you reach 5th level (2d6), 10th level (3d6), and 15th level (4d6).

At level 18, each creature within range, other than you, must succeed on a Constitution saving throw for every 8 feet the caster moves or take 4d6 thunder damage for each failure.