The Thirteen Factories (十三工房,Jūsan kōbō) is Ouroboros's R&D subdivision that manufactures its Archaisms in the Trails Universe. Its head authority is Dr. F. Novartis, Anguis No.V.
A mysterious network of factories that is described as Zemuria's underground market where they manufacture the Archaisms developed by the society. Their engineering is labelled to be the most cutting-edge towards all sorts of machinery, including weapons, gears and automatons.
The Thirteen Workshops have also been referred to in the Doll Knight series of books in Gagharv, most specifically those in Weltluna.