"As for the second reason... This world lacks a [Heavenly Dao]."
Lu Xuan looked up at the sky.
He wasn't just referring to the planet Naga Star beneath their feet, but the entire universe in which this planet resided.
"Devil cultivators who harvest souls and cultivate through blood consumption have to bear heavy karmic retribution, with each bit of karma returning as heavenly tribulation upon them."
In the Archean Eon World, heavenly tribulation was not a reward system, but purely punitive.
There were cultivation methods for using heavenly thunder to temper the body, but heavenly tribulation is purely about beating cultivators to the brink of death, with no benefits offered, and no help in repairing the body after the ordeal.
Thus, crossing tribulations often requires help, as cultivators are at their weakest right after, making them vulnerable to enemies.