I gave the three dead girls to Laurencius. At the bottom level of the Orc Cave under the Iron Mine I killed Arthamon. And after that i am stuck .I cant talk to the skeleton wall at the Devil's Hole or with wall at the hole under Glatzburg Place of Execution. What can i miss?

Hi, I have a similar problem.
- I already entered Cerdie's Domain under Alvaron and finished the respective quest.
- In the ritual cave under Glatzburg Place of Execution, I can "talk" to the pentagram once, but I get the text as if I just discovered it, i.e. "I should examine the body ...", after this dialog (and reentering the cave), there is no place to interact with.
- In the Orc cave from Act 1, at the pentagram in the west of the lowest level, there is no way to interact with the pentagram or the surrounding walls.

Is this a known bug? Is there a patch for that? Or a way to fix it with a hex editor?

If I'm not mistaken this is not a known bug and I'm quite sure there is no patch that would specifically address this. Could you please send me your latest save (from your "Documents\Inquisitor_SaveGames" folder) to kovar[@]cinemax.cz so that I could have a look at your problem? I was already trying to find out what could cause this but since my options are limited and I don't know what it is that triggers entrances to the Kingdom of Destruction (in Orcs Caves) and the Kingdom of Pandemonium (in the Shrine of Pandemonium) it is possible I won't be able to find a solution. But I can always try to forward your save directly to the dev hoping they will find an answer.