Factual error: Every time the silver nitrate is shown on clothing, it is shown as silver. Silver nitrate in fact is black once exposed to light.

Underworld (2003)
Plot summary
Directed by: Len Wiseman
Starring: Bill Nighy, Kate Beckinsale, Michael Sheen, Scott Speedman, Sophia Myles, Shane Brolly, Erwin Leder
A war has been going on for centuries between vampires and Lycans/werewolves, never seen by humans eyes, until one of the werewolves by the name of Lucian (Michael Sheen) finds out about one human that can bond with vampire blood and Lycans blood, Michael (Scott Speedman). Selene (Kate Beckinsale) is the vampire Death dealer that finds out why the Lycans are following Micheal and falls in love with him. Kraven (Shane Brolly) is the leader of the vampire house after Viktor (Bill Nighy) dies and wants Selene by his side, but she is a wild cat who can't be controlled.
Lucian: We were slaves once. The daylight guardians of the vampires. I was born into servitude. Yet I harbored them no ill will. Even took a vampire for my bride. It was forbidden, our union. Viktor feared a blending of the species. Feared it so much he killed her. His own daughter. Burnt alive for loving me. This is his war. Viktor's. And he spent the last 600 years exterminating my species.
Question: Can anyone explain Lucian's arm blade? It seems totally out of character for him, and every time he changed to wolf form he'd have to track it down and reattach it. Moreover, since these vampires don't have any weakness to metal, there's no special advantage in using a metal blade instead of his wolf claws. So what's the point?
Answer: Removal of the head kills everything. Immortal or not. At least that's what I saw.
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Chosen answer: In most of the shots, Lucien takes his coat off when he changes to wolf form, and the blade would be attatched to a mechanism in him coat. Also, the film gives us an example of the blade hurting a vampire: bloodloss. And that kind of weapon could do some serious damage, and as it probably wouldn't kill the vampires, it would almost definitely slow them down.