Source: Champions of Valor
By following a ritual taught by the Fangshields, your natural attacks are suffused with the power of silver and are fully effective against lycanthropes.
Prerequisite: Base Fortitude save +4, member or ally of the Fangshields.
Benefit: Your natural attacks and unarmed strikes count as silver weapons for the purpose of overcoming damage reduction.
Special: If you are a lycanthrope, your natural attacks no longer infect others with lycanthropy.