Eldritch Wave

A wave of crackling energy rolls outward in a 10 foot sphere. Creatures within 10 feet make a STR saving throw. On a failed save, each creature takes 1d10 damage and is knocked prone. On a save, the creature takes half damage and is pushed 5 feet away. 

The spell creates more than one wave when you reach higher levels: two waves at 5th level, three waves at 11th level, and four waves at 17th level. Make a separate attack roll for each wave.