Hello I had the same issue and I never pullled the lever however I am not on level 8 or 9 anyway you need to discover more rooms and find the artefacts and. Break all of the boxes and urns - you will also need to change in to the god form and pull ch...

I have 99% completed level 3 however I am stuck at the same point there is no lever to pull the hold man keeps showing me to how to pull the lever but there is no physical lever so I can not move on pls help