Thundering Stride

Powerful shockwaves of thunder accompany your movement. For the duration, your walking speed increases by 30 feet, and each time you move at least 10 feet on your turn, a burst of thunder erupts in a 10-foot radius around you. Each creature in that area must make a Constitution saving throw, taking 2d8 thunder damage on a failed save, or half as much damage on a successful one.

At Higher Levels: When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d8 for each slot level above 3rd.