Pirates of the 7th Sea
Acts as a normal cutlass without the penalty on attack rolls. The chain acts as a grapple gun.
A cutlass taken from one of the undead crew of the Black Freighter. The crosspiece is a skull and bones design, and the pommel is a grinning skull. When the hilt is twisted a certain way, the pommel shoots forth a chain of linked bones, and the skull bites down on the first thing it strikes.