Tzim’chevaghol is Orin’s homeland, a gillman city hidden beneath the waves of the Arcadian Ocean.
It was devastated in the Apocalypse, when the Arcadian Ocean was drained.
Shalako led many gillmen from Tzim’chevaghol to Nirmathas, in search of Orin, hoping to escape the reach of the aboleth. Orin dedicated himself to finding a safe place for his people, primarily in Lake Encarthan.
Orin ran into an old member of Tzim’chevaghol’s Sightless Council, Hagen, in Illmarsh. The gillman, ever loyal to the aboleth, had been attempting to bring corruption to the Ustalav city and turn them to the worship of the aboleth.