The dungeon at Yulin Estate wasn't too challenging to clear. It seems Master Yulin had only recently set up the formation to mass-produce the deadly octopus-like creatures. With no profound research into malevolence or demon spawn, they simply rampaged around with their tentacles. They were quite easy to deal with.
However, from the altar inside, it was clear that Yulin Estate had colluded with Divine Teachings. The octopus eggs and the formation of the altar were clearly imparted by Divine Teachings to Master Yulin. Their plan was to let them grow stealthily in this hidden corner. If they were to become a bigger threat before being dealt with, it would be a hundred times more troublesome than now.
