This vast palace was covered by an Array, rendered Formless and invisible to the naked eye. It would only manifest when touched by power.
This method was indeed quite brilliant. If Tu Xiao'an had to find it himself, he could have torn the Snake Palace apart and still come up with nothing.
Observing the ancient palace, it looked like a yellowed, withered tree, filled with a dispirited Death Qi.
"The Snake King from two generations ago was imprisoned in here?" Tu Xiao'an was a little surprised. 'How could a mere palace hold a Great Demon Snake?'
'Or is there more to it than meets the eye, with layers of traps inside?'
Elder Snake replied directly, "Your Majesty, the defeat of the Snake King from two generations ago by King Liu Yao happened a very, very long time ago. Also, while the outside of this palace is concealed by an Array, there are no traps inside."
"It's not that the Snake King from two generations ago *can't* get out, but that he is unwilling to."
