"Fighting someone who holds the full power of a mana geyser is a tremendous task, but it would have been feasible if Kolga's isolation didn't delay the discovery of its horrors long enough for Myrano to complete his ritual." Xoth replied.
"You see, that thing that floats about the city it's both the source of Kolga's inhabitants' powers and an effective means of defense. Somehow, Myrano's ritual completely splits the light from the darkness element and accumulates the light in the form of a sun.
"The ritual also cracked both the mana cores and the life forces of all the people inside Kolga, making them both Myrano's prisoners and slaves. As long as they remain close to the Forbidden Sun, the cracks allow them to absorb its energy.
"Those people can live for two hundred years, keeping a youthful appearance until the moment of their death. They don't get ill and any wound is almost instantly healed.