Chattering Bone

You target one creature within range and line of sight and cause it’s bones to painfully vibrate, that creature makes a strength saving throw. On a failed save the creature takes 2d6 bludgeoning damage, 2d6 cold damage and falls prone. On a successful save they don’t take the cold damage and are not knocked prone.

For every size above medium the creature takes an additional 1d6 bludgeoning damage. 

Any creature within 15ft of the targeted creature can hear its bones vibrating and see its muscles stretching.

At higher levels: when you cast this spell with a spell slot above 2rd level the cold and bludgeoning damage each increase by 1d6 for every spell level above 2nd