Alchemist
This professsion is able to make potions or other ingestible items fto enhance the player or heal them. They have to have certain ingredients that have to be collected from around the world and some need to be "harvested" by herb hunters. They will need to buy vials or jars to store potions in and this will help us get gold out of the game as well.
For some items perhaps they have to go to a certain place like a cauldron to make some edibles. Others they can make in the field using vials they carry or just "mold".