Black Orchid
Death Incarnate
I ran into him the other day for the the first time in Solitude. I was actually doing the quest looking fro the traveling pilgrim. I thought maybe he was the pilgrim I was looking for so I tried to talk to him, and he attacked and summonsed a gargoyle. A bunch of guards jumped in and he was dead in no time.
Ugh, I have had to kill him so many times I've just gotten to the point where I let out a blood-curdling scream and charge him full speed and hack him down in a blaze of fiery dual-flurry attacks before he can summon that annoying gargoyle.
I frequently fast travel to Riverwood to sell stuff and use the forge (it's close to my cabin), so I usually see him there. Since everyone's asleep, and there's only one guard left, the responsibility falls on my shoulders to slay the foul demon. Unfortunately he's already taken the life of the Smith's wife and one other guard, so now it's become personal between him and I.