The year was 6520 in the Primordial Era.
Jian Country's five armies, totaling a hundred thousand soldiers led by the second prince, invaded Yun Country.
The royal family of Yun Country mobilized an army to resist, but after three defeats in a row, within less than a year, the majority of their territory had fallen.
As Yun Country was on the brink of being completely conquered by Jian Country, a group of cultivators suddenly appeared before the Jian army, wielding Array Flags and casting the Sky-covering Mysterious Fog.
The Jian army couldn't find a way out of the range of this fog; seeing their supplies running low, the second prince had no choice but to resort to his last strategy and ordered the construction of an altar.
The ones deploying the fog were from a sect called The Green Pine Sect. The entire sect consisted of only twenty-two cultivators, who had taken action because the Great Elder owed the royal family a favor and thus had agreed to help.