This silver bracelet contains charms of stars and moons that hold power against lycanthropes.
Arms Slot 680 gp
Treat weapons you wield (including ammunition, thrown weapons, and the like) as silvered (Player’s Handbook, page 220).
Power Daily (Free Action)
Trigger: You hit a shapechanger with a weapon attack.
Effect: The creature reverts to its natural form and can't use polymorph powers (save ends).
Published in Adventurer's Vault 2, page(s) 55.