Diagram: Draug's Confession

Game asset files would suggest that this diagram exists, but it has not been found to date. It should allow Geralt to have the sword Draug's Confession forged.
NB. I just had it in my inventory after act II. Dont know how.
de:Schema: Bekenntnis des Draugen
fr:Schéma : aveu de draugr
it:Schema: Confessione del draug
Category:The Witcher 2 crafting diagrams