You cause the earth below to shudder with impending destruction. When you cast the spell, choose a point on the ground you can see within range. A powerful geyser of boiling water erupts centered on that point in the form of a 10-foot-radius, 60-foot-high cylinder. Each creature within that area must make a Dexterity saving throw. On a failed save, a creature takes 3d6 fire damage and 3d6 bludgeoning damage, and it is hurled up to 30 feet into the air. On a successful save, they take half as much damage, and aren't hurled. Additionally, 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 are within an area with volcanic activity present when you cast this spell, the spell's fire and bludgeoning damage both increase by 1d6.
* - (a piece of obsidian and a drop of water)
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