Weaponsmith's Guild Legendary Recipes vendor. Rob Greenfield in the Weaponsmith's Guild Hall in Thorin's Hall. Or the unnamed vendor of the same label in the Galtrev hall.
A spaceship from another star / They ask me where all the people are
I tell them I'm the only one / There was a war, but I must have won
I thought that was the first place I looked, but it wouldn't be the first time I stared right at what I was looking for and couldn't see it..."yea, I'm a man and I don't see any peanut butter! Oh, yea, there it is"
They are not listed as crafted relics. You buy the recipes for the barter item that you turn in to get your sealed relic box. Given the massive number of recipes on the Weaponsmith NPC, it was very hard for me to find these recipes.
Unless stated otherwise, all content in this post is My Personal Opinion.