Conjure Explosive

You conjure a simple magical explosive next to you or in your hands. This explosive is spherical and weighs about 10 lbs. It has an AC of 13 and 5 hit points. When its hit points drop to 0, when the spell ends or when you stop concentrating on the spell, each creature within a 15 foot radius sphere must make a Dexterity saving throw. A target takes 3d8 force damage on a failed save, or half as much on a successful one. This explosive can affect creatures behind solid objects, but those creatures take half damage.