Godskin Noble. I'm going for a certain very talked about sword and this fat bastard is in the way. Definitely the most challenging enemy so far, even if I do sleeping pots and am at a good level for it. I just need to get back at it, but this game really tests my quite limited patience at times.
All Godskins are annoying bosses until you learn them and how to play around their flaws (I still maintain that roll is ridiculously long), but there are ways to cheese:
1. Sleep (pot, torch, sword)
2. Poison cloud (won't wake him)
3. Rot (pots, breath, whatever)
4. Sleep again
5. Wait for double ticks to do their thing
6. Get in a critical attack just before the end of the sleep
7. Repeat
And of course use obstructions when he goes Limp Bizkit. At the back of the room is a good one, but pillars will do the trick as well.
There are also ways to force certain attacks if you're a parry god.