I've found the emporer's tomb. How do I get to the emporer?

Hint 1 of 4:

There are three pedestals here.  Try clicking on them.

Hint 2 of 4:

You will find that each one has a receptacle for a glass globe.

Hint 3 of 4:

And each one takes a globe of a different color.

Hint 4 of 4:

If you're short on globes, you should just keep exploring.  There are enough
extra ones scattered throughout the crypts to help you here.  Every crypt has
at least one globe, and a couple have two.  (There was also a spare globe
near the yellow charger.)