Zoethall was founded in the Lith-Crillion Era by kuo-toans drawn along the strong currents of the Sea Tunnel. Their journey along this ancient canal ended when they were pushed upwards in a column of water. Taken upwards by the Rath Vun, they found themselves swimming through the mixing waters of a lake called Lokzii Ahraan, the Angels Wound. For a time, they eked out a miserable existence in partially submerged caves along the lake's western banks. Their hunters ended up finding a passage that goes into the bowels of the Underdak, a passage called Tumbo Gein. Where this passage becomes part of Vul Sahsir, they built the settlement Zoethall.
Zoethall's Svirfneblin are Qya-Qhar slaves or descendants of slaves.