Gracklestugh
The city of the grey dwarves, and sadly home to a sprawling slum of Derro.
Inside the city is a trade district and docks, a large market, but also the inn Gholbrorn's Lair and the tavern the Shattered Spire. Near a peer of the docks, the adventurers met with the merchant Werz Saltbaron who entrusted them with spell gems to be transported to the city of the deep gnomes, and nearly was assassinated by the Empty Scabbards. There is a secret underwater entrance (to the Derro slum?) near the docks which the assassin must have used.
Connected to the walls surrounding the trade district is Overlake Hold where Errde Blackskull deputized Stool's Irregulars to look for proof of corruption within the ranks of the guard. Perhaps Gorglak is worth looking at more closely.
The forges of the city are kept alight by the great flames of Themberchaud the Wyrmsmith, and the Keepers of the Flame. The Keepers have appointed Stool's Irregulars to try to recover a lost dragon egg.
Outside the city is cavern inhabited by a village of stone giants. One of the giants went screaming through a part of the city driven mad, and Kais notices that the giant had six fingers which showed new evidence of chaotic corruption. The head giant <<Name?>> asked the group to look for the source of the curse, he sensed it within the city walls.
Droki, the flighty roguish Derro with outlandish hat, has invited Kais to follow him and learn something.