Nerosyan is a fortress city, constantly being built and rebuilt. It guards the confluence of the Egelsee River, arising in the Estrovian Forest, and the chill western fork of the Sellen River, flowing south from the high tundra and the eternal northern icefields beyond. The city is laid out in a diamond pattern in the angle between the rivers, with perpendicular bastions partitioning it to slow the progress of invaders. Dozens of towers surmount the walls, capped with slit-pierced screens sloped at high angles to shed heavy snowfall and to guard its defenders against flying horrors.
The fourfold gates of the Cruciform Cathedral at the city’s heart allow the crusaders to respond quickly to threats from any quarter. For those who know where to look, Nerosyan retains a subtle residue of its piratical past, but in general it is a city with clarity of purpose, indomitable strength, cool beauty, and a sharp edge poised against the corruption just across the river, well-earning its nickname of “the Diamond of the North.”
Sources: Pathfinder Chronicles Campaign Setting