This rune adds +1 to the character's Armour save. The Rune of Stone is an exception to the normal Rule of Pride which forbids the same combination of runes to be used on several items, so a single Rune of Stone may be inscribed onto any character's armour. The Rune of Stone is also an exception in that it cannot he used more than once on the same item, so it is not possible to give two or three Runes of Stone to the same character.