Asteroid belt

When you speak the command word, a stone no bigger than 1 foot in diameter that you are touching starts to orbit you 1d4 feet away from the belt, the more stones you have orbiting the belt, the slower they orbit.

If a stone hits a creature, it deals 1d6 bludgeoning damage.

You can speak a different command word to make all the orbiting stones to fall to the ground.

The stones orbit you until you speak the command word to drop the stones, or you remove the belt.