Shadow Covenant

The Shadow Covenant is a secretive society spread across the world, most agree their origins began as a group of Halessi assassins responsible for the assassination of Jaher before spreading through his empire and beyond.
The covenant is known to employ the magic of shadowmancy in their dark arts and have been known to come to blows against The Magisterium.
For a long time they were often employed as assassins by vying noble lords and merchants, though by the 17th century and the decline of the Magisterium they were known to be shadows controlling puppet governments from within.