Captain
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It seems that even without obelisks, the Grail still exists. You just have to search the entire map to find it. I'm pretty sure this was the case in one of the versions, but it's been too long since I checked, so I don't remember.
Have you checked?
In The Shadow of Death, it definitely happens, but I don't remember if this was mentioned in the list of differences from Shades of Darkness.
Дипломатия - искусство говорить собаке "хорошая собачка" до тех пор пока не найдешь подходящую палку.