Realm of Ash
Around the year 381st of Third Blaze, the reign of Hallus came to an end. The blazing sun, a source of power, fuel, and guidance, was corrupted from an unknown source. Announcing the end with a catastrophic explosion that shook the Realm itself, the sun grew dim and began to draw in heat rather than gift it to the creatures of Hallus. The explosion covered the Realm in Primal Ash and the Old Ways were brought to a staggered halt. The machines that the ancient civilizations relied upon began to suffer from cascading failures.
This event, now named the SunFade, has only gotten worse with the generations. Civilization has been able to cling the ruins of their past, repairing or scavenging the machines of the Old Ways to fight against the growing cold. But with each year the sun grows colder and more of the Old Ways become unsalvagable.