The Broken Rune is a Consumable item introduced in Elden Ring: Shadow of the Erdtree. Golden traces of the grace bestowed upon those who fell in the realm of shadow. Use to gain 500 runes.

Runes were the first writing system of the Germanic people, appearing in the early centuries AD and used in Scandinavia until the late Middle Ages ...

It appears the stone was intentionally fragmented, based on the way it was broken, and individual pieces were placed in different burials that occurred later. Over time, rune stones have been used ...