Burrowing bits

Package comes as a slingshot wrapped in a little bag. The bag produces one pebble per minute with a maximum of five pebbles. When a shot the pebble impacts the target, it begins burrowing. One can save against the pebble by immediately brushing or flicking it off. The pebble causes 1 point of damage on impact regardless of save. The pebble can be removed any round thereafter by cutting it out or using a magnet to pull it out, such removal is immediate but suffers any normal damage side effects caused by the removal device. The pebble will continue to burrow and cause 1 point of damage every round until removed. The slingshot can shoot one pebble per round.