Only the finest master crafters in Tamriel receive special master writ invitations from Rolis Hlaalu, the Mastercraft Mediator. To become a recipient of these prestigious documents, crafters have to be certified, be recognized as a master in their profession (Level 50), mastered all of the proficiencies in those professions (Solvent Proficiency 8, Metalworking 10, Tailoring 10, Potency Improvement 10, Recipe Improvement 6, and/or Woodworking 10). Once you successfully complete a master crafting writ, you will be rewarded with writ vouchers that can be used to purchase special recipes such as the target skeleton, legendary furniture for each profession, components of the Aetherial Ambroisa recipe, and more.
The Vaniverse Gaming has posted an interesting video on the mechanics of Furniture Crafting to be included in the next ESO updated called Homestead. He visits each of the different types of crafting stations and introduces the new “recipes” and crafting currency. Duration: < 18 minutes.