Notes from author
This isn't a pvp character, this is from a lore perspective. The rings and weapons are most likely the ones he would have been wearing during the fight, maybe no the Cov. Of Artorias ring, but I put that there because it was his ring.
Artorias used the CoA ring to stop himself from being taken by the Abyss only to have it happen in the end, he lost his shield during the fight protecting Sif, his Wolf companion, breaking his arm. His arm broken and no other option left he cursed his Sword to kill the ghosts who stood in his way, leaving Sif behind.
He had been taken by the Abyss...
(Most likely the covenant of Artorias ring, the ring that kept him protected from the abyss, had been given to Sif to further protect him, and therefore without his ring to protect Artorias from the abyss it overcame him)
Being taken by the Abyss he lost his mind, he lost who he was. While you fight "Artorias" he pleads with you to end his life, and save Oolacile from Manus, by killing "Artorias" you free the real one trapped inside. Saving Sif gives you the option to summon him during the Manus fight and you also get a special cutscene when you fight Sif.
Artorias is by far the most amazing boss and character in all of DKS. His and Sif's story are some of the most tragic in all of the game.
Artorias you will be missed...
Enjoy the build!