Board Thread:Arrow discussions/@comment-9346948-20180309045038/@comment-24152851-20180316065541

I'd say every martial artist/warrior who matters would have heard of Ra's. He's a legend and it would be a disgrace to have notheard of him.

As for Slade knowing Nyssa is Ra's daughter, I'll just refer you to get catch phrase. "I am Nyssa Al Ghul, daughter of Ra's al Ghul"