Éibhear Hattori

Éibhear Hattori is an elven master blacksmith in Novigrad masquerading as a baker. He sells a variety of runestones, crafting components, the following quest items:
 * Edwin Greloff's fourth map
 * Well-preserved notes by Hieronymus on the witcher Elgar
 * Worn-out and faded notes by Hieronymus on the witcher Elgar

and diagrams, including:

Associated quests

 * Of Swords and Dumplings
 * Scavenger Hunt: Griffin School Gear Upgrade Diagrams - Part 4
 * Scavenger Hunt: Wolf School Gear Upgrade Diagrams - Part 1
 * Scavenger Hunt: Wolf School Gear Upgrade Diagrams - Part 5