You swing your greatsword with such might that you create a series of shockwaves and fissures that target your enemies. Choose up to ten creatures that you can see within range. Each creature must make a Dexterity saving throw. On a failed save, the creature takes 14d6 force damage and is restrained by a fissure that opens beneath it. The fissure is 10 feet deep and filled with molten rock. On a successful save, the creature takes half as much damage and is not restrained. The fissures remain for the duration, or until you use a bonus action to close them. A creature that starts its turn in a fissure must make a Constitution saving throw or take 5d6 fire damage from the molten rock. A creature that ends its turn in a fissure can use its action to make an Acrobatics or Athletics check against your spell save DC to break free from the restraint.