The Rounded Pebble 'Travak' (3d6) (+8,+5)
Small round stones. When fired with a sling, they could even hurt a giant.
You can use them for 'f'iring a sling.
A rounded pebble imbued with the powers of the elements.
It does extra damage from acid, electricity, fire and frost. It
poisons your foes. It cannot be harmed by acid, cold, lightning or
Level 5, Rarity 1, 0.2 lbs, 5000 Gold

(T.o.M.E. 2.3.5)