Big Gay Beam

You conjure all of your strength to assault your enemies with a massive blast of lightning. All creatures in a 15 foot wide, 120 foot long rectangle in front of you must make a Dexterity saving throw. A target takes 12d12 lightning damage on a failed save, or half as much on a successful one. This blast deals double damage to structures. Due to the massive amounts of energy used to conjure the beam, you can not take any actions during your next turn.