Sigurd

A Blacksmith from Arinbjorn is beside his normal profession one of those playing gwent. He sells crafting components, runestones and a number of crafting diagrams, including:
 * Diagram: Amateur's weapon repair kit
 * Diagram: Journeyman's weapon repair kit
 * Diagram: Master's weapon repair kit
 * Diagram: Skellige longsword
 * Diagram: Svarog runestone
 * Diagram: Veles runestone
 * Diagram: Perun runestone

Associated quest

 * Collect 'Em All