Pregenned world with 3 necromancer towers in the top left corner, all within attacking distance for a fort.

I do use a few mods, which are present in this save - no aquifers, increased coke production (10 per Bit coal, and 5 per lignite), custom corpse disposal reaction at smelters, magma-safe furniture from crafts workshops and display cases

And in case it effects it, I use the Mayday graphics pack