Wrath of Tiamat

You unleash the unbridled might of Tiamat's breath in a 120 foot cone or a 15 foot wide, 200 foot long line (your choice). Each creature in the area of your breath must make a Dexterity saving throw, taking 10d6 Acid, 10d6 Cold, 10d6 Fire, 10d6 Lightning and 10d6 Poison damage and are afraid of you for 1 minute on a failed save or half as much damage only on a success.