From Blood Wiki
The Nightmare Levels expansion pack for Blood II: The Chosen, inspired by the Hellraiser series. It consists of a sharp metal hook attached to a chain. The weapon works by flinging the hook, which creates a tiny portal, out of which comes a chain which hooks into the victim. Multiple chain-portals can be created, trapping the victim. The hooks pull out small lumps of flesh, and disappear.
AMMO TYPE: None (Focus)
REGULAR FIRE: Fires a chain at the victim which attaches and drains health for a time
ALTERNATE FIRE: ??