You unleash a beam of acid in a line 5 feet wide and 100 feet long, which stops early if it impacts a creature, Large or larger object, or solid surface. If the beam hits a creature, the creature must make a Dexterity saving throw. On a failure, it takes 12d4 acid damage and an additional 4d4 acid damage at the end of its next turn. On a success, it takes half as much initial acid damage and no additional damage.   If a creature or object is killed or destroyed by the beam, the beam continues until it impacts another creature or object.