The Spiral Labyrinth is the central home of warlock magical research and knowledge. It is considered the underground headquarters of the world's warlocks, of scholars and students of lore, where a great deal of arcane knowledge was hidden. All of the ancient magic of the warlocks, as well as the magic that has been invented in recent years, is dutifully recorded and kept in the Labyrinth.
The location of the Labyrinth is unknown, even to the Nephilim. It possibly exists in its own pocket dimension separate from earth. Its age is also unknown. According to the earliest Nephilimic writings, it was already considered ancient in the time of Elphas the Unsteady.
Jordan Kyle once argued that the Spiral Labyrinth's records were so extensive that it rivaled the Silent Brothers' archives and that the werewolves had nothing that could compare, but the Praetor Lupus' library was the only one that could come close.
The sigil of the Labyrinth is a spiral symbol.
Though they did not know much about the war going on aside from the rumors they heard and the things the Shadowhunters told them, the Clave worked in cooperation with the warlocks of the Spiral Labyrinth in December 2007. Tessa Gray was among the warlocks at the Labyrinth at the time. They were consulted—and paid—to try and find a way to strengthen the wards and reverse the effects of the Infernal Cup and essentially cure its Endarkened victims. Their studies of Amalric Kriegsmesser's body showed that there was no plausible way to do it and have given up looking for one, knowing it would be futile—something Tessa informed the Consul of through fire-message.
Upon Zachariah's suggestion, the Clave approached the Labyrinth about a way to defeat the faeries that have sided with Sebastian Morgenstern against them. The warlocks sent those in Alicante instructions to protect its citizens from the faeries, along with boxes and bags of supplies of ammunition and materials—such as salt, grave dirt, and tools and weapons made of wrought cold iron—that can be used against the fey. The materials were placed or used as weapons, and others were spread throughout the city and its infrastructures.
When the Scholomance was reopened, its students and Centurions were given access to their libraries.
For some reason, a piece of the shirt Cordelia Carstairs was wearing when she died in 2007 is at the Labyrinth. Her daughter, Emma, managed to get ahold of it through various connections and bribes. They have tried to decode the writings on the bodies of Malcolm Fade's victims, to no avail. With Magnus Bane, Jem Carstairs, and the Silent Brothers, they were able to charm a map to alert them when necromancy was being used.
- The magic by which one may travel there is apparently one of the most closely guarded secrets in all the world. It is rumored that a geas placed on all warlocks at the moment of their birth guarantees that if a warlock reveals the Labyrinth's location to a non-warlock, the result will be an instant but blindingly painful death.