The Sacrament of Communion
Whispered of in hushed tones among the congregants of the Church of Caine, this sacrament is known by many names across the Kindred world. The Vaulderie. The Blood Chalice. The Vinculum. Developed during the Anarch Revolt by members of the Old Clan seeking to break the chains of their elders, this sacrament serves as the perverse foundation for loyalty within the Sabbat, and has kept the Church of Caine dedicated to itself in the harshest times.
The dedicants of the Church spill vitae into a ceremonial chalice with a special tool reserved for this sacrament, starting with the priest and being passed between vampires until all have shed vitae. Then, the order is reversed with each member sipping from the chalice and the priest draining what remains. Loyalty is created and enforced by Blood, complicated artificial emotions taking hold within a parish to ensure that they remain dedicated. While it is an ultimately unhealthy practice, this sacrament reinforces a vampire's sense of self in a community and can treat Stains like a twisted Conviction.
System: Each participating vampire drains a Rouse Check's worth of their own fresh vitae into the chalice, slaking no Hunger when they sip. The consumption forms a mutual Blood Bond with a Bond Strength of 1, and repeating this sacrament may increase it by 1 each time. No regular Bonds may form until this Bond Strength decays to 0, through any pre-existing Bond remains until the sacrament Bond Strength matches it. This Bond does not count towards the limit on vampiric thralls.
As a demented form of group loyalty blooms, the vampire must test to resist the Bond (see Vampire: the Masquerade p.234) whenever they would act against the group, it's values, or in betrayal of those they are bound to. Each story, a vampire Bound in this way may ignore a number of Stains equal to half their Bond Strength (rounded up), so long as they were gained for the benefit of those they are bound to.