Fort Terremirius was a city located near the city of Koenigsbath on the Harkanian coast. It served as the capital of Nova Sevinia for a sixty year period starting around 2350 BA. In that time, though, most of its buildings were modeled after the local wooden long halls, a few Sevine-style villas dotted the civic landscape in the form of the Courthouse, Hall of Records and Gubernatorial Manor. Additionally a temple to Thalia, the Sevine storm goddess was built of concrete on the cliff edges.

Known as a "fort" because it originally was intended as a military barracks and refugee camp to serve until rescue arrived, Terremirius was a center of both political power and culture for the small but dedicated population of Sevine colonists. It was there that Sevine tradition was most closely observed and that the architecture was most directly reminiscent of that which had existed in their home across the sea. In the spring of 2300 BA, however, tragedy struck Fort Terremirius in the form of a concerted attack by three of the four major Chaos gods: Tzeentch, K'horne and Slaanesh. In a matter of hours, the unprecedented focused malice transformed the city into a degenerate parody of itself, mutating the citizens and warping the streets themselves.

A mass exodus of the relatively unharmed Sevinic peoples was arranged and Terremirius was abanonded to its new masters. The chaos gods remained for a few weeks, further warping the city until at last they had befouled every inch of it. Once abandoned, the city crumbled and wasted away into ruins. A hundred years following, an expedition of Sevinic descendants, eager to scourge their memory of the Fort where they had almost been destroyed, as well as purge any thougts of rescue from Sevinia, came to the ruins and took them apart piece by piece. Many were killed by the monstrosities that still lurked within the crumbling walls, but eventually they were able to erase all but the foundations of the city. The land was sewn with salt and lead and today only the faintest outline of some of the more impressive structures can be seen.

It is however, still a place of strange chaotic phenomena. For centuries, travelers have claimed that they have seen the city appear in its heydey, full of strange citizens speaking a queer tongue. Some even claim that they have stayed in the city for a week or more, before awaking one morning and finding themselves in an empty field, perched on the coast.