Go to the House of the Hero in Windurst Walls and speak to Carbuncle.

Then go to Port Bastok and talk to Juroro located at (I-8). After following the dialogue Juroro hands you the Earth Pendulum and tells you to travel to the Quicksand Caves in Altepa Desert.

Within the Quicksand Caves, you will need to make your way to the Cloister of Tremors located at (C-8). Within the Cloister of Tremors you will see an Earth Protocrystal.

Trade the Earth Pendulum to the Earth Protocrystal. A short cut scene will take place. After the scene ends you find yourself in the battlefield. You have 30 minutes to kill the NM Galgalim that spawns at the top of the ramp.

After you kill the NM, return to Bastok and talk to Juroro.

Return to Windurst Walls and talk to Koru-Moru located at (E-7).

This Quest is Repeatable

This Quest requires Zilart

Mind you. You have to get the Quest as a level 40 smn^^