TwoSix
Programs in KOBOLD
Total tangent, but you really shouldn't have many prisons in a high-level game. By that point, raise dead and resurrect are common enough that high-level "prisoners" are just killed and then have their remains stored in somewhere secure if they're needed.- Be Aware of Demographics Understand the PCs place in the world. If high level characters are common then it’s one thing but they are likely not to be. @GuyBoy told me a story of a campaign he was a player in where the prison guards were all 20th level spellcasters. Implausible and lazy. Breaks immersion and is the same school of management as ‘rocks fall you die’.
Or, you're just focusing on the "progression fantasy" aspect of high-level play, and the mundane prison is there to be set dressing to show how powerful the high-level character is.
High-level prisons should be extraplanar places like Carceri, for beings that are powerful enough that normal divine soul magic just does not work, and killing the prisoner would have negative effects, or simply isn't possible.