Liquid bullet

Liquid bullets are the colloquial name given to small orbs found throughout Rusk. These orbs, no larger than a marble, are the byproduct of some sort of spell once used to store liquids into small spaces. Each bullet stores 5 gallons of liquid, though the liquid does not have to be water. While stored, the liquid retains all the properties it had when stored, even freshness or temperature. When hit hard, the bullet breaks and releases the liquid.
Bullets can vary in shape, size, material, color, and engraving. While scholars largely agree that liquid bullets were used for storage as opposed to weaponry, the bullets can be used as projectile weapons. When used in a sling, they will deal an additional 2d4 damage on impact as the liquid is violently released. This is in addition to whatever damage the liquid inside may deal.