I guess he means that once the Mastery is trained you can't, in fact, buy the recipes even though it is written you should be able to. https://imgur.com/a/21vVvnd EDIT: My bad, though It says You need to have the Dragon Slayer Weapons skin AND the mastery in order to unlock the recipe. So it's not bugged so far. Yet to unlock a skin and try again. EDIT 2: It works, made the normal Dragon Slayer Weapon , unlocked the skin and I could purchase the corresponding recipe for the Crimson and Azure Dragon Slayer weapon recipes.