A human claiming to be a vampire doctor who uses The Book of Vanitas to cure vampires suffering from the malnomen. He is connected to the original Vampire of the Blue Moon and forms an alliance with Noé to heal the sick vampires and confront the mysterious Charlatan.
Working together to heal cursed vampires using the Book of Vanitas
Working together to solve vampire-related cases
Ruthven often acts as an antagonist to Vanitas
Working together on medical cases involving vampires
Professional relationship within their shared field
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