The six Emperors immediately set to work arranging for people to enter the Human Clan and search for the descendants of the Ling Family. Group after group entered, except for the Northern Sea, where nobody dared to approach. The rules of the Northern Sea, set in the past, could not be broken without facing death.
It's truly unknown what kind of rules the Northern Sea has or who established them that even Immortals fear them, and they withdraw immediately. The Northern Sea seems to be a very profound place indeed.
The Five Ancestors Sect has already sent people over, looking for that Great Achievement Stage Eight Layer powerhouse of the Human Race. They have already come knocking, but they cannot find the Heroes' Tomb, after all, it is the Land of Vanishing Traces, not a place that just anyone can find.