Upon further observation, Raze assumed that Reno was an alchemist, but after seeing his powers and having come to his place of work a second time, he realized that it wasn't the case. An alchemist was either a single individual or a group of people that large clans would have.
They would supply the clan with the best type of Qi pills as well as medical herbs and more, all for the sake of improving the clan's condition. In some cases, they also worked with the physicians, helping them create the right combination of things to progress healing.
They were an important and essential part of large clans. Some of them knew how important their position was, and rather than work for an individual clan, worked on a for-hire basis or with merchants, creating a market of sorts.