Rohan Krause is the leader of an organization in the 17th century known simply as the Order. He plotted the resurrection of Count Dracula using a blood sacrifice in his aim to gain power and immortality whilst serving at his side. He claims to have killed Desmond Belmont's parents, even though he had the Vampire Killer. He is a master of alchemy and was in possession of the Magic Gauntlet, the very same item Rinaldo Gandolfi had given to Leon Belmont centuries ago.
However, the Belmonts and their allies were able to track down the Order long before they were ready to revive the Dark Lord properly. He is defeated at the hands of Desmond, who stated that he was only seeking the prevention of Dracula's revival, not revenge for what he had done to his father.
Though his dreams of being one of Dracula's right-hand men during his reign were shattered, his own blood was sufficient to raise his lord and Desmond had to battle an early risen Dracula shortly afterward.
Rohan is the penultimate boss in Castlevania: Order of Shadows. He fights using a variety of alchemy attacks which Desmond is able to use, including the Hellfire, Firestorm, Frostbolt, and Thunderbolt.