A column of divine energy comes down around you, striking down those in your way. The column is 20 ft. wide and 30 ft. high. Each hostile creature must make a Constitution saving throw. A creature takes 5d8 radiant damage and is knocked prone. On a save a creature takes half damage and is not knocked prone. 

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d8 for each slot level above 5th.