The Deepest Shadows

A secretive network that Trick was once part of. They orchestrate chaos to justify their intervention, potentially manipulating or working with The Cult of the Wandering ShardA powerful, secretive organization operating within [[Places/The Necklace] and now expanding eastwardlders.

A powerful, secretive organization operating within The Necklace and now expanding eastward.

To Trick's surprise and horror, their ranks seem to now include Gnoll, Shadows, rather than simply Tabaxi.

From reference
-Trick’s former organization. Her notches mark her as a high-ranking assassin, and she remains unsure whether Walleh would see her as an asset or a threatTo Trick's surprise and horror, their ranks seem to now include Gnoll, Shadows, rather than simply Tabaxi.

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Courtney's text in Notes

The Deepest Shadows (often referred to as just The Shadows) are an all Tabaxi organization lead by The Leader/The Master/The Deepest One/The Deepest Shadow that has a system of indenture. Parents are given money in exchange for their kittens, and the kittens are educated and trained. To repay that debt, kittens owed nine contract killings--these kills are tracked by notches in the ears. When the debt is repaid they have earned their freedom, as well as the offer of being "enshrouded" in The Shadows. The Deepest Shadows control the river and thus have a great deal of power in The Necklace. They have known about The Wandering Shard for at least eight months. They may be using a connection to the cult to sew chaos in Ytesh in order to create a problem they can sweep in and solve to expand their influence. They may have done similarly before to expand their influence in Council of Oteon will not stop them, though the crown may try. Trick believes she has accidentally accelerated the time table or further empowered The Leader by "killing" him.