tornado lightning

in a 300ft radius centered on you massive tornadoes start forming in random locations around you. every creature other than you in the radius has disadvantage on all weapon attacks whether melee or ranged for the duration. on the 2nd round all enemies must make a dexterity save against your spell save dc on a success taking 1/4 damage round down, on a failure take 8d6 lightning damage as a lightning bolt strikes you.