Erupt

You draw molten lava up through the ground in a 100-foot-radius sphere around you. Every creature within the area that fails a Constitution saving throw takes 15d10 fire damage and catches on fire.

Furthermore, anyone wearing metal armor who fails the saving throw is also affected as though by a heat metal spell. A successful saving throw negates the heat metal effect and halves the damage. Structures and unattended objects automatically fail the save.

Erupt leaves its entire area a blackened ruin incapable of supporting plant or animal life for a full year.