- Go to Rabao and talk to Maryoh Comyujah, who's standing in front of the windmill at G-7.
- She will ask you to do something for her.
- Travel to Western Altepa Desert head to C-11 and enter a tunnel.
- Exit tunnel to hidden area of Western Altepa Desert and head down the ramp to D-12 and zone into Quicksand Caves.
- Go to K-8, go through a weight sensor door, to the East.
- Weight sensor takes 1 Galka, 3 Tarutaru, or 2 of any other combination to trigger.
- On the next map open another at G-8.
- Walk through the door and fall down the pit.
- Look for a ??? around where you fell at the pillar.
- Touch the ??? and select Yes to spawn the Ancient Vessel.
- Kill the Ancient Vessel and inspect the ??? again to dig out the Scrap of Papyrus (key item).
- Return it to Maryoh Comyujah who will give you the Cerulean Crystal (key item).
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