You cause the blood within a creature’s body to boil with supernatural heat. Choose one creature that you can see within range that isn’t a construct or an undead. The target must make a Constitution saving throw. On a successful save, it takes 2d6 fire damage and the spell ends. On a failed save, the creature takes 4d6 fire damage and is blinded. At the end of each of its turns, the target can make another Constitution saving throw. On a success, the spell ends. On a failure, the creature takes an additional 2d6 fire damage and remains blinded.