I can give you a tip, but I can’t explain everything or tell you exactly how to beat the game. The tip is this: you need to go back to the room where the Holy Grail is and take it.
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