It\'s close ro a Small tunnel don\'t know if dwarfs can enter it but it\'s at their hight.
It looks like this:
if you jump all the way down after you entered true the temple you come at a cave like place you can walk untill the end and there\'s one stair, you can also walk past this stair and you will see a small tunnel.
I entered the stair and then when you walk up the stairs you come in a small cave and then you see a brige and a lower level. the lower level is the same way as the higher level but the lower level has acces to the smal tunnel. if you come at the end of the high level you will see a steep road and when your up you see a port to the labyrint.
But when you go through thje lower level you will see a ladder at the and on the rigth and that leeds to the same place.
The crystall can be found near the leader back in the lower level.

I hope it\'s clear what place I mean