The use of Rune Stones is an ancient tradition of the Celtic people, and produce some of the most effective stones and charms. Centered around the Celtic belief that magic flows through everything in the material world, and by engraving a rune into an object you are giving the object's magic a medium through which to affect the material world. Runes can be placed on most anything so long as the rune can hold its shape, and the stones can have a wide variety of effects depending on what runes are used and the combination in which they are written. The most common medium seen are flat, disc shaped rocks, but runes may also be engraved upon weapons for added damage, armor for extra defense and durability, or stitched into clothing and charms to give positive or negative results. It is believed that most anyone has the ability to use active rune stones so long as they have sufficient magical proficiency, but magical abilities are not required to feel the effects of passive stones.