C1673 Five Elements
In every single level of the Heavenly Tower, there would always be a time when one would go berserk.
Berserk was the equivalent of a baptism. If one was adapting to it, there was a 90% chance that the cultivator would be able to withstand it.
If one suddenly entered the barrier and went through a berserk experience, it would basically be a waste of one percent of the Pagoda Pearl's energy