How do you get to Ghed'here

The game automatically takes you to Ghed'here 2 times.
The first time is while you are sleeping after you give the Statuette to Prof. Gray.
The second time is after you give Stella her ring end exit the Temple in Thais.

Hope this helps...remember to do everything and exlplore while you're in Ghed'here the second time as you can't go back to Ghed'here until the next chapter of the game; Gates of Night.