How can I return to Quendor?

Hint 1 of 5:

Have you mapped out the Plane?

Hint 2 of 5:

There are three curtains in various places around the Ethereal Plane.

Hint 3 of 5:

There are also three shops in various places around the Southlands.

Hint 4 of 5:

By walking through a curtain, you can get back to Quendor.