Boysenberry's Iron Maiden

Alright kiddos! You start this bad boy off with a snap of your fingers, then you do the step, I promise you can do it all by yourself. A Medium or Large creature you can see within range must make a Dex saving throw baby! On a failure a Iron Coffin with the pained expression of the person entrapped on the surface appears and slams both sides shut as they are closed inside. The target creature takes 8d6 piercing damage on a failed save or half as much on a successful one. If the creature did fail its saving throw it is fully encased by The Iron Maiden, gaining full cover from those outside and those outside gain full cover from them. A creature restrained by the Maiden may make a Str saving throw at the end of its turn to break free, on a success they are free, on a failure or if they do nothing they take 3d6 piercing damage.