You call fiery forces from below the earth to erupt upwards violently, causing the rocks beneath a point to melt and erupt into magma. The ground in a 10 foot radius explodes in a shower of fire and magma, raining down in a 20 foot radius. Creatures within the area must make a Dexterity saving throw. On failure, they take 4d10 bludgeoning damage and 4d6 fire damage. If a creature is within the 10-foot inner radius, then they are additionally flung 10 feet into the air, taking 1d6 bludgeoning damage and falling prone when they land. On a successful save, a creature takes half damage, and suffers no additional effects.
The center 10 foot radius becomes difficult terrain until cleared. Each 5-foot-square portion of the area requires at least 1 minute to clear by hand.