Emak's disarming wave

You bring forth a wave of thunderous energy, staggering and disarming any in its path. all creatures within a 20 by 15 foot cone of you must make a constitution saving throw, taking 2d6 thunder damage and dropping any equipment they are holding, with it landing 20 feet away from the in the direction of the spell on a failed save, and taking half as much damage and not being disarmed of a successful save. if a save fails be five or more, that creature is stunned until the end of it's next turn.