Boulder Throw

You hurl a boulder at an area or a creature within 120 ft. Every creature in the area must make a dexterity saving throw of DC 16 or take 8D6 damage and are knocked prone. On a successful save take half damage and ignore the prone condition. 

The boulder creates a  10ft by 10ft cover. If a creature is behind cover they roll with advantage and the cover is replaced by the boulder unless the cover is magical.

*Must have a clear path of at least 50ft or only deals 4D6 and doesn't knock anything prone.