As you might expect of a quest from Liang, this one requires you to earn lots of pearls. It comes hot on the heels of completing the Rill the Wise Quest, and is another which you will likely have in your Royal Quest Log for quite a while.
Send Bayoo, Bluebelle and Rill to find treasure at the Elemental Nexus
Send Tanya, Rill and Greenleaf to find treasure at the Kraken Cave
Send Leif, Bayoo and Greenleaf to find treasure at the Frost Owl Spire