"These defense modules include mechanism traps as well as things similar to puppets."
Tang Yu took an interest in several of the modules.
[Guardian Stone Sculpture]: Construct a set of stone sculptures placed around the castle which, when enemies approach, activate and transform into fierce beasts to attack the enemies.
[Illusion Passage]: All the corridors and staircases within the castle have the ability to shift, allowing only one's own people to move unimpeded within the castle.
[Thorny Flower Crown]: Within the castle garden, some flowers are endowed with aggression, unleashing a tempestuous assault on intruding enemies.
These modules, while not as powerful as No. 1 and No. 2, were most importantly genuine defenses for the castle and obviously couldn't double as workers for digging and such tasks like the Puppet Guards could.