Those nine stone pillars had caught Wang Chongyang's eye before due to the remarkable dragon patterns on them, but it wasn't until this careful inspection that he noticed the odd characters next to the dragon patterns, which were similar to those on the turtle shell.
Wang Chongyang didn't know if these characters were of any use, but he took some talisman paper and bit his finger to use his blood as ink to temporarily copy them down.
He copied all nine pillars, and after seeing that there was nothing else in the room, he then left.
Afterwards, he searched several other rooms in succession, paying special attention to the strange characters, and indeed found a few more places with them, but without exception, they were all very brief, only two or three characters each.
To be safe, Wang Chongyang copied them down as well.
Other than the turtle shell and the odd characters, Wang Chongyang found nothing else of value in the vast palace, which disappointed him.