Tremor

from a point on the ground of your choice within range, you create a sudden small earthquake. Each creature in a 15-foot-radius circle centred on that point must make a Dexterity saving throw if a creature has a flying speed they make the saving throw with advantage and if a creature is not on the ground they automatically succeed the saving throw. A creature takes 3d8 Bludgeoning damage on a failed and have their walking movement speed reduced by 15ft, or half as much damage and no speed reduction on a successful one.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d8 for each slot level above 2nd.