Lol the fume knight was my hated enemy when that DLC came out the first time. I hated him for a while but I soon came to find him as one of my favorite bosses in the game. I also really like the gank squad in the sunken city DLC. That one was a hell of a challenge that I managed to do solo. It took me 45 minutes of running in circles doing a bit of damage to each, but I felt so accomplished once I finished it.