Chronicles of Khaldun: Crux of Eternity
Snailstones are iridescent pieces of stone carved from the massive flail snail shell in the tabernacle of the Shrine of the Snail. They have the ability to summon heroes from other worlds and eras, although this ability is tied to cosmic time and is not under the control of the wielder.
Perhaps they were once able to be used at the holder’s whim, but no longer.
Lady Dul’besibrara Melithlylth’wyn knows the secret of snailstone creation.