Despite of (or perhaps because of) what Mobead Headkicker claims, there is no fifth member of the Black Flames. He has made the occasional claim that there is another member, but his actual details of said member are extremely vauge. Aside from the fact that they were a Dark Iron and wer allmost certainly male, Mobead seems to be unable to recall any specifics of the individual. It's almost like he was making it up, and ran out of ideas towards the end.