Tartarus is an icy inferno.

Yes, by the way, should the city be depicted during the day or at night? I suggest night. All the buildings should have intricate carvings made of malleable ice. (If anyone doesn't know what malleable ice is, check out the forum forum.df2.ru; I posted some fantasy excerpts there describing the world of ice demons.) Absolute cold doesn't really make sense. Perhaps the Grail should be called the Absolute Zero Laboratory. As for Ancient Cold... Imagine a space where the temperature has been -150 degrees since the Paleozoic era. Oxygen lakes, frost falling from dry ice... And the 8th-level building should be called the Hall of Primordial Cold. The cold that existed before the creation of the Universe. Mugais, I'd like to be so bold as to ask GrayMage for a subforum for Tartarus. I like our concept more and more every day, and I think more people will join in. P.S.: Painting the demons blue is terrible. It's better to take the ones from Heroes 4 and restore them. Added after 14 minutes: By the way, a property for the Grail: (which is also easy to implement) - the entire landscape becomes snowy (snow is a bonus territory for Tartarus). And all the "clover fields" and the like become "glaciers" - there's such an object in the new terrains; let it prohibit fire magic. Moreover, not the entire landscape at once, but within a radius of +5 per day.