JaPan: Yrden and 5 or 6 heavy blows. Fight ended in 50 seconds. On normal.
This. Killed it on the first try on hard by just trapping it 3-4 times with Yrden.
Most bosses break out instantly or very quickly, so I think most people getting stuck here aren't even trying that because they assume it will be ineffective. But this boss doesn't break out at all. My Yrden wasn't upgraded, but I could easily get behind him and take 25%+ of his health each. Was actually a bit disappointed at the difficulty of this boss after I had so much trouble with the Act 1 boss :p
I agree with people about the bad autosave spot though, but I never ran into that problem.