Silver's Promise is a Klaive that is going to be canon (hopefully) in the By Night Studios: Mind's Eye Theater: Werewolf: the Apocalypse setting.
It is also going to be made into a physical latex weapon, thanks to the BNS KickStarter and Waypoint Games.

Based on a concept from a tabletop game of Werewolf: The Apocalypse run by my friend  dogsoul, the new incarnation goes along these lines, but may be revised or altered to fit the official storyline:

Before the Apocalypse fell upon Gaia, there was a Caern in Colorado known as Silver Heart. A natural silver vein ran through the Caern, and Silver was the totem spirit. On a great mission, a broken klaive had been claimed from the halls of Fenris and brought back. It was reforged with the silver of the Caern, a Fenris spirit bound to it, and the klaive blessed by the Caern spirit as its protector and known by the name "Silver's Promise."
But the Caern was lost when a great Spiral Dancer known as The Destroyer and his pack arrived, killing the Theurges and then burning the Caern to magma. Within the ruins remained Silver's Promise which was discovered by the owner's Metis son known as Runs-Red, who now holds it in his possession.

The blade is fairly simple in its design, other than its gleaming, mirrored silver blade, as it does not need fancy adornments to prove itself worthy in combat. It can be wielded single, or two-handed.