Ammo (i.e. ammunition) is a type of equipment that is required for the use of most ranged weapons.
There are four types of ammo in Elona. They tend to be quite heavy (~1-7s) but never runs out.
Some ammo have special limited uses in addition to unlimited normal use:
Magical: Deals random magic damage (As if your weapon had options such as "deals lightning damage ###". Element is random.) Somewhat common. (usually 10~30 charges)
Piercing: Adds more piercing to your attacks. Exact bonus is unknown. About as common as magical bullets.
Explosive: A ball (possibly grape shot) explodes where the bullet hits. (usually 10~20 charges)
Rapid: Fires 3 shots at a time, but each shot is a little weaker than your original shot. Quite common. (ranges up to 30~90)
Burst: Fires at every enemy on the screen. Tends to be scarce. (usually comes in single digit charges)
Timestop: Stops time the same way "occasionally stops time" works. Very scarce. (up to 6)
These uses can be refilled by blacksmiths or a Special ammos box for everything except Timestop.
For more information, see Special Ammunition.