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Or you could put a pyramid in the center like the Maya people had, and then erect a monument to the water goddess and other buildings on top of it! You can make a swamp around the pyramid, and then the walls!
I like this more... because not every single building will be in the mire.... here are my suggestions:
1st lvl. troglodyte burrows-dark ravines
2nd lvl. lizardman caves-grotto of shadows
3rd lvl. gnoll towers-ancient towers
4th lvl. snake nests- ?(+ a spawning area will increase the growth of snakes)
5th lvl. gorgon lair-halls of darkness
6th lvl. chapel of silence-Temple of silence
7th lvl. sanctuary of horror-cathedral of death
ps: you wrote that the race worships the water dragon, so why would a statue to the water goddess be erected?



