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Investigation, how to investigate?
Simply go there?
Definitely not.
Although this world is special, with Seventh Realm cultivators having the ability to break through realms, theoretically they could ascend to the Immortal Realm, or travel to other domains, theory is just theory; the reality involves many other considerations.
First of all, there's the danger.
Putting aside the process of breaking through a realm, let's talk about what comes after that.
What's the situation in that world, what kinds of forces are present, what sorts of creatures, what kind of culture, what is the attitude toward outsiders, ascenders, and are there any relevant mechanisms...
These are all issues that need to be considered.
If this is the case even for ordinary ascenders, as the master of the Wandao School, a revered Taoism Monarch of one age, Xu Yang has even more to consider.
