Death rock

You throw 4 volcanic rocks in the air while muttering the incantation they grow huge then fall at a creature in range. Each creature in a20-foot-radius sphere centered on each point you choose must make a Dexterity saving throw. The sphere spreads around corners. A creature takes 20d1w fire damage and 20d12 bludgeoning damage on a failed save, or half as much damage on a successful one.

The spell damages objects in the area and ignites flammable objects that aren't being worn or carried.