Got it.
There are 2 tablets that looks the same in that room. One is held by the skeleton and that is a trap. Take the other one - don't touch the one held by the skeleton. The real one is close to that skeleton.
As for the heads of the Gods:
Lie down, sleep and click immediately to wake up to nighttime
Place the Royal Scope on each of the 4 stands close to one of those heads around the room and look at the star pattern. Note them down.
After doing that - Move the lever to the other side and go down the stairs.
