Burning Radiance

A 60 X 5 foot line of light emanates from you, in a direction of your choice.Each creature in the line has to make a Dex saving throw. On a failed save, a creature takes10d8 radiant damage and catches fire, and then takes an additional 1d10 fire damage at the start of it's turn, until someone takes an action to extinguish the fire. On a successful save the creature takes half damage and avoids catching fire.