I second the notion that he probably got it from the Sparda family's ancestral home considering that V was born there. The only other idea I could think of was maybe it was created from Nelo Angelo's armour maybe.Nico's Analysis said:That cane V's always lugging around. I took the liberty of checking it out once, but didn't see anything out of the ordinary. Sure, the metal's a good conduit for demonic power and all...but there must be more to it than that. Well, who knows. Maybe he does just use it to get around.
It's a devil arm , his Sandle's are too they are called Abel
He got the cane at the amusement park in DmC , it's actually made from silver candy