The dark city of the Fae Mhor in the Underdark realm Nindolen
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The alien and strangely disturbing buildings of Erelhei-Cinlu are crowded together in a welter which would confuse any not born and bred to the place ... not even the Fae Mhor are certain what horrors lurk in the sewers beneath. The main ways of this ancient and depraved city are thronged with as unlikely a mixture of creatures as can be imagined. Green cloaked illithids and Kuo-Toans rub shoulders with Dark Elves ... None are disturbed to pass a lesser demon or succubus, or a night hag or mezzodaemon ...
These crowds part hurriedly for Noble Fae Mhor riding nightmares or the more powerful demons or nycadaemons ... Between 8,000 and 9,000 Fae Mhor live in the city, and double that number of half-castes, servants, and slaves. The tiers and dungeons of Erelhei-Cinlu reek of debauchery and decadence, and the city's inhabitants are degenerate and effete.