Dragonslayer Ornstein

Dragonslayer Ornstein is a secondary villain in the video game Dark Souls. He is a mighty dragon knight who guards Princess Gwynevere in Anor Londo. He serves as the boss of the area alongside Executioner Smough.

Overview
Ornstein was one of Lord Gwyn's most trusted knights, and the first knight chosen to serve as his Four Knights of Gwyn, the others being Artorias, Gough, and Ciaran. Believed to be the captain of the Four Knights of Gwyn, he was granted a special soul and Leo Ring by the Lord of Sunlight to enhance his abilities.

His golden armor was made to resemble a lion and imbues the power of lightning. His spear is believed to slice a boulder in two. After the gods fled Anor Londo, Ornstein guarded its cathedral alongside Executioner Smough, but the two were defeated by the Chosen Undead.

At some point, Ornstein left the cathedral in search for the Nameless King. It is unclear how Ornstein survived the battle against the Chosen Undead, leaving speculations that the one defeated by the Chosen Undead was only an illusion or puppet. His armor is found in the Archdragon Peak, leaving the result of his search and fate uncertain.

Personality
In contrast to the cruel and sadistic Smough, Ornstein fights with nobility and honor for his namesake and loyalty to Lord Gwyn. He dislikes Smough's canabalistic natures, but seems to get well along with him in battle. In the boss battle, should Smough go down first, Ornstein softly places his hand on Smough's corpse in a sorrowful state as if thanking him for his duty before absorbing his powers. This heavily contrasts with Smough's reaction should Ornstien fall first, expresssionlessly crushing him with his mallet to obtain his lightning powers.

Trivia

 * In Dark Souls II, a character known as Old Dragonslayer appears as an optional boss in the Cathedral of Blue. He highly resembles Ornstein and has a near identical moveset, but embodies dark magic instead of lightning. The Collector's Edition guide confirms the two are the same.
 * Ornstein and his Leo Ring are homages to Russian-American pianist, Leo Ornstein, an experimental composer in the early 20th century.