Ask Ikaa in Elven Caravan to see your future. She will might see some things related to Farrelli's quest of finding the Clockwork Island, but she will also propose you to find a "focus to channel the power of the ancient".

In order to find it, she says that you must go far East, where the sand meets the silt, and begin to search.

Well, head to Altaruk with a shovel, and go as far East as you can in the area, to a sort of cape. Dig there ("use" the shovel), and you might find the Orb (a black stone) as well as around 1.500 XPs...

You need to STAND on the exact location, so if you don't find it, more slighlty from place to place. It's the place of your icon that counts, not that of the shovel.

Bring the orb back to Ikaa, and she sees in your future that you will travel the Silt Sea toward a island near Balic, where you will find a "well kept secret"... And that's all! But you now have access to Pirates' Cove buy taking a skimmer to a island near Balic.