Area A circle on the ground with a radius of 20 yards centered on a point within long range

Duration 1 minute

The ground shakes and heaves violently in the area, which becomes difficult terrain for the duration. When you cast the spell and at the end of each round for the duration, each creature standing in the area must make an Agility challenge roll. On a failure, it takes 1d6 damage and falls prone.

In addition, when you cast the spell and at the end of each round for the duration, any structure in contact with the area takes 2d6 damage. A structure destroyed by this damage collapses, and everything inside or under it takes 4d6 + 10 damage. Creatures on top of the structure might take falling damage when it collapses.