-The solution-

  You have received the spheres and take another close look at the gate. As with the star gate, you recognize two star-sculptures on the gate with two round, cut-out holes.

  You hesitate for a moment, but then you place the spheres in the holes and they actually fit perfectly!

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  The shield that prevented you from entering disappears and you can now enter. However, if you have horses, they must be left here. They are too reluctant for you to drag them into the darkness with you. Besides, handling the animals in this way would probably not be good for you or the horse. The merchant will certainly take care of them.

  Now go to section 45 to enter the mountain.