RTF is a global modification that replaces all towns in the game.

Indeed. Perhaps something like:

"Gloomy Angh," "Dark Finist" (or something similar :()"

...

"Tene-wing"?
"Herald of the Night"?

Something immediately brings Dungeon to mind :D

Added 4 minutes later
Although "Herald of the Night" seems like a good option. And give it invisibility :D.