Devestating Laser

Upon casting this spell, a magical face appears 5ft in front of you and say's whatever you want in a deep booming voice, any creature that can see/hear the face within 20ft must roll a wis. save or be frightened. On your next turn the face expels a massive beam of pure arcane energy in a line of 120 ft. any creature in the beam must roll a dex. save, the creature takes 3d10 force damage on a failed save and half as much on a success