Dragon Roar

You let out a bellowing roar to intimidate your foes. A Hostile Creature within a 20-foot radius of you, that can hear you, must succeed on a Wisdom saving throw or drop whatever it is holding and become frightened until the end of their next turn.

When you cast this spell while you have temporary hit-points you can use a bonus action to deal either Fire, Cold, Acid, Poison or Lightning damage in a 30-foot line in-front of you. Creatures caught in this line must make a Dexterity saving throw or take damage equal to number of temporary hit points you currently have times 2 or half as much on a successful save. At the end of your turn your temporary hit-points become 0.