This is the main quest in Chapter 6. When you exit the Underdark, you are brought before Elhan, leader of the Elves. If you offer him just reasonable answers to his questions, he asks you to find the Rhynn Lanthorn which will allow him to open the entrance to the Elven city of Suldanessellar which Irenicus has sealed off.
Go back to Athkatla and finish off any jobs you haven't done yet. Gather allies as described on the Chapter 6 overview page.
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