Posted byon July 10, 2018.
Last updated byon June 13, 2019.
Source: Rewarded randomly when using 5 Animated Particulates received from the Talos of Gaia during the Anniversary Event. The Shem of Silver will only appear as a possible pet through Animated Particulates after having faced the Silver Talos at least once.
A precious gift forged from precious metal. Or so it would have you believe.