Thermobaric

Target a square you can see within 120 feet. All Creatures within a 30ft radius must make a dexterity saving throw against your Spell DC or take 3d8 force damage and 2d8 fire damage and be knocked prone. On a success each creature only takes half damage and remains standing. The damage increases by 1d8 for each spell level above 5th. The radius increases by 10ft at 7th and 9th level.