Take the prohibition banner currently refined by Xuan Xiao as an example; in terms of might, it fell far short of a heavenly tribulation.
In reality, the true cause of the heavenly tribulation's descent lay with the star stone. Having existed within the Dao of Heaven for an immeasurably long time, this star stone naturally carried traces of the aura of the Dao of Heaven.
That was why it stirred a heavenly tribulation that had vanished from the world for countless years, causing it to descend once more.
Chapter 1509