Shi Feiyang didn't duel with Cai De inside the pagoda, for the state of the Golden Ship was extremely unstable; it could fall back into the vortex at any moment and sink even deeper into the Earth's core than before.
His goal this time wasn't really to seize the treasure but to lure out those who would stop him from securing it.
Therefore, he first entered the first floor of the pagoda, not completely lifting the prohibition but preserving its essence. He only opened a portal and went in.
Inside the first floor were many spears, halberds, sabers, and swords, with nine archaic treasure swords being the most conspicuous. These were the Nine Palace Divine Swords used by the Yellow Emperor in battle against Chi You, forged according to the Nine Palaces Eight Diagrams, corresponding above with the Nine Heavens and below with the Nine Wilds – an amalgamation of swords refined for demon banishment.