A large rune was marked on the head of a runehammer, indicating the spell it carried and giving the item its name.
It had the ability to cast a single spell once per day, but the spell was the same each time, stored in the hammer. There were three common types of runehammer: Alhalbrin carried heat metal; Faerindyl carried burning hands; and Thundaril carried polymorph other, often into either a snail or toad.
Forging a runehammer required the spell that was stored in the weapon.
Depending on the type of spell stored, the hammer could be worth between 11,000 and 18,000 gold pieces.