a round stone

You see a very common little stone. The stone is grey, hard and round. It could certainly be used as missile with a sling.

It is a round stone.
Its accuracy is awful, and it inflicts very little damage upon hitting.
It is made of stone.
It weighs about an ounce.

You identify a round stone.
It is a stone missile.
Offensive bonus -5 and damage 2.
It weighs one ounce, and it is worth about two busc.
Its keywords are stone, round, and missile.