Gods of Madness
During The Cataclysm most Dwarves went into hiding underground in Briaran. There they led a harsh life defending against foes underground, but found solace in the old gods. In the years before uniting with Mezula and forming the Rose Kingdom, Briaran became a society of nobility and faith led by divine casters of the old gods.
After the Godsfall many dwarves were lost without their gods. Some took to the sea off of Briaran becoming sailors, some took to meditation and worshiping their bodies in place of gods. Those who survived the Godsfall without a faith became accustomed to the new gods, particularly Sisko or Seibo.
Briaran is mountainous and full of minerals and precious metals. It is ruled by dwarven lords so is populated mostly by dwarves, but dwarven fishermen and pirates have brought in human and gillmen smallfolk.