Dragonsbane (Revised)

You unleash a focused burst of force energy specifically attuned to harm dragons. Choose a dragon within range, the dragon must make a Dexterity saving throw. On a failed save, the dragon takes 6d6 force damage and is frightened of you until the end of its next turn. On a successful save, the dragon takes half as much damage and isn't frightened.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.