PSA: when you go to tell that female doctor that she’s being cut off and manage to placate her/win the fight. And agree to help for a reward. Do not choose the ring if you don’t have the blood sorcery skill.
Even though it says no knowledge of sorcery is needed, that’s a bald faced lie. I got the ring and have done two missions afterwards, never got any blood magic option or ring option. Probably best to choose the knowledge, though it’s not clear if she’ll teach you magic or just give you data on it. Unlike with that lady in the blood camp, one option says she’ll teach you one of a few vampire disciplines. That wasn’t the case with the doctor, just says she’ll give you texts to study. Whether you learn magic or not remains to be seen. Could be worded better, that’s for sure.