Can’t recall all details since it was right at the very beginning of the beta.
You can encounter a tomb (they reused the tomb assets for the final room ), I found it during my second run through the dungeon I believe. You can interact with the coffin. I think the person inside asks you to let him out, you can decide whether to let him out or not. My guess is that he comes out either way (I think I decided to leave him in the coffin). Anyway, it’s a skeleton.
After reading the description again, I got the idea that if you let him out willingly maybe the mob you’d encounter would not be the shade but Belevros himself.
I have yet to encounter this tomb again, but maybe it’s a one-time thing
The three blue torches can also be found in PoF.