if you managed to get the holy grail (that means that you found the key hidden in that room) you need now to find the entrance of the art gallery
Yo mate i beleive my save is bugged. I found where i need to get up to in order to go get the lost child artifact, however for some reason that area is completely blocked off for me with a door behind this black wall. You see i found a bug where you can peek inside walls and doors which was how i was able to find where the artifact was and how to get there. However when i peek through that black wall in the screenshot, i see the door i need to get up to but the door is locked and blocked by a black wall. Ill attach a screenshot so u know what im talking about