Cavern of Shadows

In the heart of Port Obsidian lies the tallest obsidian spire, "The Serpent's Sanctum", within the spire exists a sprawling labyrinth of chambers and corridors with the top-most chamber being the "Cavern of Shadows". The entrace is guarded by enchanted gargoyles carved of obsidian, though they don't not act unless absolutely necessary and most don't even know that they're constructs. To enter you must be wearing an activated Syndicate talisman, in order to activate the talisman you must be out of sight of the spire, twist the snake one time for each hour of the day up to the current hour, and then you will turn invisible and can walk through the wall of the base of the spire.
Once you have entered the spire you are met with a high-vaulted ceiling, inlaid with luminescent crystals giving it the look of a starlit sky. The obsidian walls have a textured surface that naturally absorbs sound despite the nature of the material. The dim light and silence create an atmosphere of enigmatic grandeur, a natural habitat for The Ebony Serpent.
The Cavern of Shadows is the epicenter of Syndicate decisions. The cavern contains a round table crafted from a single slab of obsidian and is encircled by thirteen high-backed chairs. Each chair is inscribed with the title of each Night Lord representing the core leadership. The largest chair is adorned with an intricately carved ebony serpent and is reserved for the Syndicate's leader.
The cavern has many alcoves that are filled with all sorts of arcane objects, maps of Port Obsidian and the rest of the world, potions, weaponry, armor, persistent portals, alchemical stations, magical research stations, and so on. In one of the mose secure alcoves they have a pedestal, on top rests a large tome "The Shadowscript Codex".