This reminds me of my playthrough of Arx Fatalis, some years after the game came out. This game is a sort-of love letter to Ultima Underworld and kind-of seems to take place in the same universe as the later game Dark Messiah of Might and Magic.
Anyway, I occasionally looked up hints when I got stuck and sometimes really needed them. Towards the end of the game there is a sequence where a werewolf is hunting you and you're forced to a spot where you seemingly must make a very difficult jump over a pit to escape. I couldn't make the jump after tons of tries and the guide had no other hints other than that you had to do so to progress.
Finally I piled some gold bricks I'd been carrying in my inventory forever that had seemingly no purpose on the very ridge of the pit and used them to get just enough of a boost to barely make the jump over the pit. It was weird it even worked.
Later I found out if you ran with vsync off it screwed up your characters momentum in the game and that was why the jump was impossible for me.