Knight Artorias

Artorias the Abysswalker is a boss in Dark Souls. He is exclusive to the Artorias of the Abyss DLC.

Location
In the Colloseum area at the end of the Royal Wood.

Backstory
Sir Artorias the Abysswalker was one of the Four Knights of Lord Gwyn. He does not appear in-game as he is deceased at the time. Not much is revealed about him other than the fact that he managed to traverse the Abyss. He wore the Wolf Ring and brandished a greatsword. He is also known to have been a friend to Alvina of the Forest Hunter covenant and Sif, the Great Grey Wolf who guarded his grave after death and kept the Covenant of Artorias ring in his possesion.

Artorias was present during the fall of New Londo, and was able to enter the home of the Darkwraiths, the Abyss, due to a special ring that prevented him from being swallowed by the void. His greatsword became cursed during his time there. In recognition of his actions, he was awarded one of Anor Londo's treasures, a blessed pendant that allowed him to repel Dark sorceries.

When Oolacile was attacked by the forces of the Abyss led by Manus, Father of the Abyss, Artorias and his wolf companion, Sif, arrived there to save Oolacile as well as the Princess Dusk, who was captured from the present day. However, the two were overrun by the creatures of the Abyss, and Artorias sacrificed himself to protect Sif using his greatshield to erect a barrier around the wolf pup. The knight, defeated by the Abyss, became corrupted against his will. His already-cursed sword became corrupted by the Abyss as well.

Attacks
Overwhelming Leap

Crouches, then leaps into the air and will attempt to hit you. This has an area of effect around him. Dodge as soon as he jumps.

Somersault Strike

Somersaults into the air and slams his sword down vertically. He can repeat this up to three times. Roll to the side to avoid it. Artorias can stunlock the player in this combo.

Black Sludge

Throws a black sludge in an arc in front of him.

Charge

Charges at the player. If it lands, it will hit the player twice, dealing heavy damage.

Trivia

 * Artorias, like many characters, had unused content that was hidden between the game files. Here is the dialogue that was kept out of the final version.
 * Artorias was supposed to have the same voice actor of Griggs of Vinheim, but as you can see, his content was cut out of the game.