Manshoon

Manshoon was the founder of the Zhentarim, also known as the Black Network, until he was "slain" by Fzoul Chembryl, his ally, and Lord Orgauth in 1370 DR. However, it transpired that Manshoon had created a dozen or more clones that the murderous duo then found themselves facing. Eventually all the clones where killed thus ending his life for good.