The so-called Tianjiao sealed within the pages of history refers to a situation where two extremely strong Heavenly Prides emerge in the same era and power structure. To avoid internal strife, one is sealed to be available for when a succession is needed in the absence of a Tianjiao.
However, this is not the most interesting aspect. The real intrigue of this sealing system lies in the fact that the victor is the one who gets sealed, leaving the slightly weaker contender to become the ruler of the current era.
Of course, such Tianjiao wouldn't intentionally lose. Showing anything less than their full strength would disqualify them from being sealed and would mean they have no right to vie for the position of Sect Hierarch or Emperor.
Because it is the loser who takes over the power, this system greatly reduces internal conflict to some extent.
The reason for the loser's ascension is to protect the sealed individual.
The person sealed remains in a state of slumber.
