Lava Stompers

Hot Boots. While wearing these boots you can walk over molten rock such as lava or magma as if it were solid ground without taking damage.   Ground Breaking. You can use an action to stomp your foot down on the ground. All ground that is unworked earth or stone in a 10ft. radius around you becomes scorching hot for one minute, during which the area is considered difficult terrain. Whenever a creature ends their turn in the area they have to make a Dexterity saving throw (DC 15). On a failed save they take 2d8 Fire damage. On a successful save they take half damage. Creatures wearing Magma Stompers automatically succeed on the saving throw. You can use this feature twice per long rest.