You unleash a beam of acid in a 5-foot wide that is up to 100 feet long, stopping early if it impacts a Large or larger object or solid surface. If the beam would hit a creature, that creature must make a Dexterity saving throw. On a failed saved, that creature takes 12d4 acid damage and an additional 4d4 acid damage at the end of their next turn. On a success, they take half as much initial acid damage, and none at the end of their next turn. If a creature fails their save against the spell and does not die from the immediate acid damage, the beam ends and the line stops. If the beam is ended by an object, that object takes the full acid damage from the spell immediately. At Higher Levels. When you cast the spell using a spell slot of 5th level or higher, the initial damage increases by 1d4 for each level above 4th.