The Sun-Forsaken South is the counterpart to the north: the latitude where Bryn's band of warmth never reaches, where prayer-coalitions cannot push the sun far enough to matter, and where the cold is not a season but a condition.
The southern question
The south's frozen state is structurally identical to the north's. No coalition in the current era has held Bryn on a southward path deep enough to reach these latitudes for more than a few weeks, and the Solar Accord's standardized rotation does not extend Bryn's path this far in either direction. The permanent cold is a consequence of which coalitions hold power, not of the world's geometry.
Historically, the south was reached. The evidence is there for anyone willing to travel to find it: the same sudden ruins, the same intact records under ice, the same relict creatures in thermal pockets. The southern warmth-windows appear to have overlapped sometimes with northern ones and sometimes not—an artifact of which coalitions commanded Bryn at any given century, and the logistics of steering the sun between hemispheres.
The southern ruins
The southern ruins differ from the northern ones in character. Where the north's buried cities show dense settlement and developed trade records, the southern sites skew toward ritual. Large stone enclosures, orientation markers, structures that appear to have been built specifically for congregation singing. This is consistent with what such a location would require: holding Bryn on a southern path long enough to make habitation viable would demand extraordinary and sustained prayer effort. The southern warmth may have been a deliberately maintained achievement rather than incidental prosperity.
Whether that means the southern civilization was primarily religious, or simply that only the religious infrastructure survived while the ordinary towns are buried deeper, is not settled.
Relict life
The southern relicts are less documented than the northern ones. Expeditions to the far south are rarer; the logistical challenges are substantial; the Crimson Coast and Dragon's Spine Mountains block easy access. What traders and explorers bring back suggests the same pattern: creatures physiologically suited to warmth, surviving in conditions that should kill them, in places that were warmer within the last several thousand years.