Diagram: Lesser Glyph of Yrden

This Diagram: Lesser glyph of Yrden can be purchased from most armorers, including:
 * Armorer in Midcopse
 * Fergus Graem
 * Willis
 * Yoana
 * The Pellar
 * Keira Metz
 * Scoia'tael Merchant in the forest outside Novigrad
 * Merchant in the red cap outside the Nilfgaardian Army Group 'Center' Camp
 * Gremist