Books in the Secret Room

After the castle was in agreement with Merlin's badge,

Castle number six showed the will to verify ownership. Every room of the castle was opened to welcome him. Outside, strong spirit energy appeared, swirling in layers, radiating strong defensive force.

Anyone without permission from the castle owner would not be able to break through this spirit barrier even if that person was a high-ranking Spirit Lord.

Rumor had it that Spirit Deity Zachmis was the one who forged the castle belonging to his disciples on each floor himself. Thus, each castle was no different from a Spiritual Weapon at all.

In the art of high spirit-forging, spirit-forging was not limited to only Spiritual Weapons. But it could forge everything, even a rock.

Only Celestial and stronger Spirit Forgers would be able to understand this type of art profoundly.