The prison from a thousand years ago wasn't much different from the one in Old Lingdun.

A gloomy and enclosed underground space, cramped cells, cold runic iron bars, and walls built with large chunks of bluestone like bread, with a dim gas lamp every few meters.

The air was slightly damp, carrying the rotten stench of a sewer.

Perhaps to dispel the damp and foul smell, there were blazing fire pits in the corridor outside the bars, where the firewood crackled as it burned.