Ornstein Ryuugari, known as 'Dragonslayer Ornstein', is a legendary knight and one of the Four Knights of Gwyn in the Dark Souls series. Renowned for his speed, skill, and mastery of lightning-based attacks, Ornstein serves as one of the most iconic and formidable bosses in the game. He guards the cathedral in Anor Londo alongside Smough, testing the strength and resolve of players. Ornstein's armor and spear are highly sought after, making him a memorable and influential character in the series.