As they neared the Imperial Palace, there were Restrictions set underground as well.
If anyone tried to sneak in from below, they would trigger an alarm upon touching the Restrictions. These Restrictions also had the effects of Sealing and killing intruders.
One would never encounter such things in the course of a normal, law-abiding life.
But the moment one decided to cause a little trouble...
...they would find that people had set up defenses everywhere.
Without complete mastery over Restrictions, there were far fewer places to explore in this world.
Before long, Lu Cang had approached the location deep underground where the forbidden knowledge was stored.
Come to think of it...
'Was the Forbidden Book Library that Luo Tedan showed me the real one?'
'Ruijia hides these forbidden places so deep underground.'
'Is Lorren's Forbidden Book Library really just built in some small woods?'
