OK, some abridged statistics
Giilia, City of Bats:
Pop: 7,100 Reanaarians, growing ever smaller due to deaths and a lack of people moving into the city, and those that are there are sombre and unhappy.
Ruler: past 200 years, Esmaran, Elven vampire, in no danger of going anywhere.
Economy: guarded, little trade with outsides, mostly self-sufficient living on cabbages, leeks and almonds which grow naturally both north and west of the city.
Military: No formal militia, as the undead offer protection enough.
Temples: won't mean anything to you, because the Gods are all different.
Esmaran has also killed all wizards that might have been in the city once upon a time. Uggurath, a monstrous ghast is chief of the Underworld, and his stench is so loathsome that his stench allows no saving throw and his touch can turn victims stone dead.
A cave complex just over a mile west of the city holds one of the largest colonies of bats on Tellene. 16,000,000 bats live in a gund underground cavern system that has yet to be fully explored by anyone, even the dwarves. There might also be mind flayers down there. The surround area teems with tribes of goblins and bugbears.
Anymore, I'm sure, would be a breach of copyright! Hope that's enough to be helpful. Giilia is nor-north-east of Geanavue, by about 98 miles as the crow flies. Zoa, you've been given some details for, but is a strange choice of other city as there are plenty of others much nearer: Aasaer, Saaniema, Xaarum to name but three. Still, for your information, it's 420 miles journey on a bearing of c. 160ºs. Most people would attempt this journey by sea, however.
Scarogoth.