Diagram: Svarog runestone

This diagram will allow you to craft Greater Chernobog runestones. It can be purchased from a number of craftsmen, including:
 * the Blacksmith in Novigrad
 * Scoia'tael merchant in the forest outside Novigrad
 * the Pellar
 * Keira Metz
 * the Blacksmith in Arinbjorn