The power of an array, besides being related to its rank, is also dependent on whether someone is hosting the array.
If a Tier Four Array is unhosted, even a Foundation Establishment Cultivator can slowly break it over time.
Moreover, if an array is not maintained for a long period, its power will gradually diminish as time passes.
The reason why low-tier cultivators often stumble into the caves left by their elder high-tier predecessors and gain their legacies is because the high-tier cultivators have been gone for too long, causing the Guardian Arrays of their caves to lose their effectiveness over the years.
Of course, these situations have nothing to do with the cave mansion Zhouyang and the others are currently observing.
The owner of their observed cave mansion disappeared just over three hundred years ago, so even if it was assumed that they perished back then, the operation of the array in the cave shouldn't have significant problems.
