Wouldn't that be the antithesis of the swords themselves? Most media I can think of portrays the spear as an evil weapon wielded by evil people (unless your using it for an evil person
). The Spear of Longinus is an interesting idea though, wouldn't surprise me if it made an appearance in a future book.
In a D&D game I actually included the swords, though I just called them The Knights of the Sword. Basically instead of nails, the swords all had a piece of the blade of a single sword wielded by former hero/ascended god. The Fourth Sword, the Sword of Hate, was made from the scrap metal left over from the forging of the three swords and therefore "hated" the Knights of the Sword. I had a proper name for it like the other swords, but can't remember how I spelled it.