Codex Craftworlds (8th Edition)

A seer of the craftworlds controls their powers by means of psycho-receptive wraithbone runes. The runes, secreted about the seer’s person, function much like keys, unlocking the power of the bearer’s mind as well as safeguarding it from the perils of the warp. With the aid of these powerful implements, an Asuryani who walks the Witch Path can read and manipulate fate itself, but if too much power is drawn, the runes will glow hot and the seer risks potentially destroying their greatest assets. Different rune shapes represent different powers and states of mind, and the more experienced a seer becomes, the more runes they can use. Themost ancient of seers may even create new runes; it is said that over the course of his long lifespan, Eldrad Ulthran has fashioned over a dozen distinct runes that he alone can master.