Create Geysers

You cause the earth below to shudder with impending destruction. When you cast the spell, choose a point on the ground you see in range. A powerful geyser of boiling water erupts centred on that point in the form of a 10ft radius, 60ft high cylinder. Each creature within that area makes a Dexterity save. On a failure, it takes 3d6 fire + 3d6 bludgeoning damage and is hurled up to 30ft in the air. On a success, it takes half damage and isn't hurled. Also, the ground in the area becomes difficult terrain until cleared.
On each of your turns until the spell ends, you can use your action to create a geyser in this way again, targeting the same point or a different one.
If you're within an area with volcanic activity present when you cast this spell, the fire and bludgeoning damage increase by 1d6.