Shar aliases: The Veiled Mistress, The Mistress/Lady of the Night.
The Castigian Cabal are a mix of worshippers, devotees, and followers (depending on their level of devotion) of the goddess Shar, though they know not her name nor much about her true nature. To them, she is a revealer of hidden truths and a patron of hidden wisdom, the one who opened their eyes and exposed the flaws and hypocrisies of the world and its existing power structures. It is through her subtle machinations and manipulative words that the Cabal was formed, with its goal of toppling the existing power structure in order to replace it with their envisioned future - one that is fair and just, though also one in which it is necessary for them to hold the most important positions of power in order to keep it fair and just.
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Shar has convinced the members of the Cabal that the only way for them to reach their envisioned future is through absolute commitment and loyalty to their cause. Half-measures and compromises are destined to fail, and one must thus be willing to go to any lengths - to commit any act no matter how gruesome or sinister - to achieve their envisioned future.