Conversation so far:
What was The Shadow?
In the radio drama, which debuted in 1937, The Shadow was an invisible avenger who had learned the mysterious power to cloud men's minds, so they could not see him.“
What other abilities did The Shadow have besides the mysterious power to cloud men's minds?
The Shadow had hypnotic/telepathic mental-clouding abilities altering and reading a person's thoughts and perceptions.

Question: Who was Khan?
Self-contained rewrite: Who was Shiwan Khan to The Shadow?