City of Souls is home to a transport circle of the same name, linked to the ritual circle at Cauldron of Faith
The region is currently controlled by House Mlezzir

Located off the south-west coast of Cyrmja, halfway to Erin the City of Souls is another deep city, nestled beneath the stormy waters of the Erin channel.

Since the attack by the conclave this is now one of the southernmost cities in the Underdark and has radically changed in geography and form. The lapping waters of the ocean are now to be found to the south were before hundreds of miles of caverns and paths lay, and a new smaller sea has formed to the west, cutting off routes towards Erin.

Carried down by the enormous force of water huge shoals of fish are now trapped in this sea and almost overnight a fishing industry has emerged. Though lacking in experience the sailors and fishermen learn more of their craft every day and if the Tarantulas were to build themselves a navy you can be sure that it would be drawn from the City of Souls.