Notes from author
Yes I know the Covenant of Artorias Ring is completely useless for PvP but I knew I wouldn't be able to get a quick roll without wearing the Ring of FaP or Havel's which IMO which would kill the cosplay for me so I went for 40/40 (the Abyss Greatsword doesn't NOT scale with Faith or Int nor does it have any magic whatsoever but to maintain its original nature it does have a Int/Faith requirement) and just enough endurance to mid roll to have a tiny semblance of mobility, no attunement slots since aside from his in-fight buff he uses no magic, and the Wolf Ring since it is his ring but in game he does not appear to have 77 poise which is what is provided with the Wolf ring and his set (I believe he is staggerable within one hit of a two-handed Ultra Greatsword, Blunt or Axes weapon during his buffing animation I could be wrong however) and 40 Vitatily, the widely consider best level for Vitality for a level 120-125 build. This is the best I could come up with without going to a dramatically high level, you could replace the Covenant of Artorias Ring but IMO it would kill the Cosplay so you had might as well stick to it as much as possible but if you must wear a different ring I recommend the Speckled Stoneplate Ring or having all of the Stoneplate Rings to swap out based on what situation you may encounter. And you could technically join a covenant but I prefer to host as opposed invading so the Darkwraiths (which he fought before he was corrupted by the Abyss) or Blades of the Darkmoon are out of the question for me and I figure being covenant-less would make sense considering before his death from the player he was defeated and corrupted by the Abyss so he is a mindless monster like the corrupted civilians of Oolacile attacking anyone and everything simply because he can and does not know any different due to being corrupted by the Abyss, mindless and hostile.