Lin Wu gazed at the disciples of the Frozen Cloud sect under him breakthrough though one by one. This was all arranged by him and he knew that the more there were the, stronger the effect would be.
And not just that, Lin Wu could even feel a synergistic effect between the cultivation of all thirteen disciples.
'The system was right, there is indeed a lot more to the Sky Bright Daoist's technique than we thought. This synergy is not even openly said, and is a hidden aspect of the technique.' Lin Wu thought to himself.
A unified breakthrough like this was originally suggested by the Emeraldine Sky Light monk ape. He had apparently gained some insights that made him think that doing so would be good.
Lin Wu was of course doubtful of it, even thinking the monkey was a fool. Lin Wu had already seen many types of heavenly tribulations and even participated in multiple of them, despite the fact that they weren't his.