Transmute Rock to Lava
9th-level transmutation (Druid,Sorcerer,Wizard)
- Casting Time: 1 action
- Range: 120 feet
- Components: V, S
- Duration: Instantaneous
You transform a natural area of stone within range of up to 10 cubic feet in volume into an equal volume of white-hot lava. A creature caught in the area when the spell is cast must make a Dexterity saving throw. On a failed save, the creature takes 15d6 fire damage, or half as much on a successful one. A creature that starts its turn in the area must make a Dexterity saving throw and take fire damage until it is no longer in the affected area. If the rock transformed by this spell supported a structure, that structure takes the fire damage (and ignites if it is flammable), and also takes extra bludgeoning damage equal to half the fire damage. If a structure drops to 0 hit points, it collapses and potentially damages nearby creatures, as described in the earthquake spell. After 10 minutes, the lava cools and turns back into rock.