Sabbat

In Vampire: The Masquerade, the Sabbat is a loose organization of cainites who reject the Traditions. Unlike the Camarilla, the Sabbat believes in the Antediluvians and Caine. Also known as the Sword of Caine, as they believe they will be the army Caine will use to destroy the Antediluvians once Gehenna arrives.

History
The Sabbat was founded in 1493, largely in reaction to the Convention of Thorns which founded the Camarilla. They are the remnants of the Anarch Revolt of the time.