People who are proficient in pharmacology can master this skill. The pharmacist needs a variety of herbs and then mixes them to create various medicines. This job demands that people have a attitude of prudence or any tiny mistake will decrease the effectiveness of the medicines.
This will probably be your most used Profession in the entire game. Potion making!!! Hell yea and you WILL need it!
NPC Profession Skills (NPS)[]
Since you can't buy enhanced potions, you can hire a NPC to craft them for you, without you having learnd Alchemical Refining at all. However he will demand a small fee for the work. According to the game description you should need no materials, but actually the fee is only for the work, you have to bring the materials yourself. For this service you can hire every NPC selling potions. NPCs will provide this service up to profession skill level 3.