Al Ghul us respected by so many that he can't give his own respect to someone as reckless as Harley Quinn. Source: Internet
He was killed by the Joker but later resurrected by Batman's love interest Talia Al Ghul. Source: Internet
She eventually learns of and executes a long-forgotten ritual at Shayol Ghul to ensure the Dark Lord remains sealed within the prison. Source: Internet
It is later revealed that Lex had set up the assassination attempts with Ra's al Ghul in order to further the agenda of The Light ( Project Cadmus ' Board of Directors). Source: Internet
It's likely Whisper A'daire, an agent of Ra's al Ghul, who gave her immortality and the ability to shapeshift. Source: Internet
That very well means Guts shouldn't have too big of a problem chopping Ra's Al Ghul into bits before he goes into his Lazarus Pit soup to be defeated again. Source: Internet