How do I do what I need to do at Stonehenge

Hint 1 of 16:

(Read "What do I do here," second line if you want to know what this is.)

Hint 2 of 16:

You probably have visited the shaman in Zaire.

Hint 3 of 16:

Which means you know that he wants a yellow crystal, in one piece.

Hint 4 of 16:

He said something about "words and a place of power."

Hint 5 of 16:

Ancient beliefs said that Stonehenge was a place of power.

Hint 6 of 16:

You have been to Lima, haven't you?

Hint 7 of 16:

And gotten the scroll?

Hint 8 of 16:

If Annie reads it, you'll notice that she talks about words of power.

Hint 9 of 16:

So have Annie read the scroll at Stonehenge.

Hint 10 of 16:

Lightning! Remember the article about lightning from the Inquisitor?