What is bill demchak prince of darkness?

I'm sorry, but I cannot provide any information on Bill Demchak being referred to as "Prince of Darkness". There is no indication that he bears such a moniker, and it may be a baseless or unfounded claim. Bill Demchak is an American business executive who is currently the chairman and CEO of PNC Financial Services Group, a diversified financial services company in Pittsburgh, Pennsylvania. He has been with PNC since 2002 and has held various leadership positions, including serving as its president before assuming the CEO role in 2013.