Create volcano

 Target a 10 foot area of ground within range, it rises 20 feet and begins to spew lava. Each creature that goes or ends its turn within 20 feet of it must make a dexterity saving throw or take 14d6 fire damage  or Half as much on a successful one. At the end of the round molten rock forms in a 5 feet of the volcano and expands by 5 feet  at the end of each round. The molten rock is difficult terrain anybody that steps on the molten rock must make a dexterity saving throw or take 7d6 fire damage or half as much on a successful save. Once the molten rock fills the whole area the volcano stops spewing lava but the molten rock stays until concentration ends.