I basically took the same concept from farming assassin bosses with a warrior and applied it to this, and added a domination skill to shutdown his healing sig. Here are the skills and attributes.
Domination: 10
Strength: 9 (8+1)
Tactics: 14 (12+1+1) <-- Ascalon Helm
Nothing in Swordsmanship, +30 Health Sword and Shield (590 Health +)
Armor doesnt matter but would prefer gladiators for the +energy, just have 80+ armor per piece, Superior Absorbtion, Superior Vigor.
Here is where the boss is located:
Here is the sword he drops:
Tactics:
- Sprint your way to his location
- Check to see if he has sword, if not rezone and repeat(works for me)
- Pull him with a longbow from the group
- Put up Auspicious then Ignorance him as soon as he gets to you, then put up Dolyaks & Deadly, and keep repeating Riposte and Auspicious
- Heal only when you have a Ripose/Auspicious up as well as dolyaks
- Use Ignorance when you have 15 energy, so try only to use deadly riposte at beggining and near the end when he has little health to kill quick
- Keep dolyak up as much as possible
- Pick up your green item and repeat

Notes:
Like I said, looking at his hand to see which sword he has has helped me. Everytime he has wielded his sword he has dropped it for me. Usually he is wielding a katana I believe, and I will rezone and run out to his location again until I see him wielding his own sword.
I find this build to be much easier to run than grenths, and a hell of a lot quicker to kill him.