What is there to do here

Hint 1 of 6:

Enter doorway on left then down then straight.

Hint 2 of 6:

Ask the person huddling in doorway   About The City.

Hint 3 of 6:

Ignore the fancy door you find.

Hint 4 of 6:

Go left. Do you have Lydia with you ? Have you been to Crisa's yet ?

Hint 5 of 6:

INSERT JEWEL that Lydia got from Crisa and something drops.