Diagram: Glyph of Yrden

The Diagram: Glyph of Yrden will allow you to have glyph of Yrden crafted. It can be purchased from the following merchants:
 * Gremist
 * The Pellar
 * Keira Metz
 * Armorer in Larvik
 * Armorer in Kaer Trolde keep