Citystate of the Invincible Overlord
Ostensibly a holy order of the Raven Queen, the Silent Sisters are the handlers of the dead. The guildmaster (by tradition always renaming themselves Hecate) is also the guildmaster of the Guild of Embalmers and Undertakers in Ahgram.
Of course, there are rumors that the Silent Sisters can not only care for the dead, but for the right price manufacture more of them. But those are just rumors.
Season 2: Ahgram