The Treka was a race neighbouring their territory in the south. At one point in history, they had been a tremendously powerful race, ruling over the vast lands that formed their country and beyond.
But now, they had been driven out by the Kalki, forcing them to retreat time and again. Before their First Celestial Emperor was born, the Kalki was a race subordinated by the Treka. They led pitiful lives.
They, and the Gaiko, another race that had been subordinated by the Treka revolted and managed to emerge victoriously. During the chaos, one of the Kalki reaped the life of a pinnacle being of the Treka and become a Celestial Emperor.
The Gaiko too reaped the life of another pinnacle being, driving the Treka to the edge. During their height, the Treka had three emperors, a tremendous power that seemed invincible. But now, they only had one emperor while they were losing land to the Kalki slowly but surely with each passing day.