I've just started the game and played it, well, a bit. Didn't decide into which guild to join yet, but I would like to know some potion brewery. Who knows, maybe I will be able to brew my own beer and wine combination.
Anyway, in order to learn potion brewery I can complete either "The Experiment" quest, or "Constantinos herbs", or whatever the name is; meaning that I will work for Constantino, what I am not sure of.
So, I tried to do the Oblivion spell. One thing I noticed: even normal peasants fight quite well (or I fight thaaat bad). Never the less, when I bit them down, they refuse to talk with me. And yes, I did find one single woman in the bed (sounds nice, right), I fought her down (that sounds a bit nastier, yes), she refuses to speak with me. So far, so good. Than I casted this Oblivion spell onto her, right into her face. And she still refuses to speak with me! So, the spell does not work. Of course, the guy who gave the spell to me (can't remember the name) does not accept this as an answer.
Another try I did: in the moment he gave me the spell, I had two new entries in my quest book. First one with description of the quest, and the second one saying that this would be a perfect opportunity to try it. So I fought the same guy down. But he just says that I fight well, afterwards. And I can't even tell him (even after casting the spell) that it works. Because it doesn't.
How did you do it? (and yes, to put spoiler text in black was not as good idea as in some other forums here on banshee. sorry)