Gates
Hao Xuan silently listened to what he had to say but he already knew what Henrik was talking about.
The "great treasure" was left behind by the last warden. It was supposed to be used for his successor, to help him or her reach a significantly high realm and once again gain control of the prison.
The centerpiece of this 'treasure' was the God's personal inheritance. But it also included numerous resources including high-grade spirit stones, cultivation techniques, weapons and so much more.
It would be a lie if Hao Xuan said he never thought about getting his hands on it, but when he saw where it was, he gave up immediately.
It was located at perhaps the most heavily infected area in the entire prison. Just getting to the place would take months without any teleportation items or shortcuts, without even taking into account the increasing number of infected creatures that would start showing up.