I've been biting my tongue about a lot of unkillable characters - like that stupid blade woman who wanted me to kill the nice dragon (is there a twist later? He seems nice now).
However, after the thieves guild made me extort a load of innocent people in riften I felt very guilty. Then I learned that Maven cow-face was the arch villain behind the whole Riften misery scenario. So then I spent ages trying to find out how to kill her on PS3. Seems like you need a jail broken PS3 and do various complex things I don't have time for.
So, like one of the Noldor Kings of the 1st age of Middle Earth, determined to achieve the futile objective of destroying Morgoth who was, let's face it, a very powerful God that the elves were no match for, I went to Riften to kill Maven anyway.
Jargo and I did a recce - had no issues wandering around - and failed to find any cunning back door methods of entry to her suite.
So then we went out, near some coffin which I just discovered is a short cut to the thieves guild (haven't gone into it yet) and hid until night.
Then we went in, stealth, killing the unsuspecting imperial guards. One of them realised I was shooting arrows at him, and started asking me to stop "We're on the same side!" - I guess I have signed up to the Legion. Anyway, he died too. It was only when I got inside the Keep (or whatever it's called) and fired a poisoned arrow into a soldier at the other end of the room that people got upset. Jargo and I killed them all (I'm level 42 or something). THere was some NPC looking like guy in the corner - killed him and he seemed to stay dead too. That was satisfying.
Then we went upstairs, killed a few more people and started laying into Maven herself. Despite the fact that I had just stormed in there at midnight and massacred her entire household she was still boasting about how being a Jarl suited her. Soon enough, however, we were smashing her face in again and again as she kept resurrecting. A level up later and she managed to run out the back door - I followed her out and back in and then some more guards appeared (and died). Then this legate someone or other, who goes down easier than sha does, appeared and is also unkillable.
So now my rage at my inability to kill Maven has turned into a cheap grinding method to level up. I guess I get to level up doing something I enjoy.
DIE EVIL ***** - or perhaps I should see myself as a spirit of vengence, forcing her to endure hours of torment that she cannot die from. Maybe I should pop by every now and then to do this again.