The Jorum of Kinsmanship is a vampiric artifact.
This is a bowl made of an unidentified blackish-red wood and carved with intricate patterns. Its origins remain a mystery. If this jorum is used in a Vaulderie ceremony, all the participants receive an automatic 10 in their Vinculum score for all the other participants. This bowl is currently the property of the Cardinal of Northwest America. There is rumored to be a second bowl which surfaced in Prague last year, but the truth of this story is unknown.
Players Guide to the Sabbat, p. 153-154