Behemoth frontman Nergal has revealed that he has been diagnosed with leukaemia, a cancer of the blood or bone marrow.Last week, the frontman - whose real name is Adam Darski - was rushed to Gdansk Medical University Hospital earlier this month, but would not reveal the cause of his condition. But now it is understood that his condition has now developed to a stage where chemotherapy is not enough. His fiancée Doda has donated bone marrow in a bid to cure his disease through a bone marrow transplant.