The Articulate Plane
The Purific Sigil is a secret organization with a mysterious agenda and ties to powerful forces all over the world. What the Sigil wants is unknown even to most of its members, who must work through a series of “proofs,” or tests of loyalty and skill, to learn more. On one side, the Sigil seems like a powerful religious cult of some kind (perhaps Vecnan?). On the other side, the Sigil seems to act like your friendly neighborhood assassin’s guild.
Acceptance into the Purific Sigil is easy, but training is 4 years of grueling physical and mental torture. Following training, new member graduate to Apprentice by transfering their soul into a glass phylactery to enable easy suicide should they be caught. They are then sent on an extremely dangerous mission. Less than half of apprentices survive their first contract.
The Sigil is tolerated in Kauthia, perhaps more than is fitting considering everyone knows their business. Possible ties between the Sigil and the Empire are unknown.