Final Fantasy V/Earth Lithograph

Pyramids
At this point you can go north to Surgate castle, or further north to Karnak, but these towns have nothing new in them except updated gossip. Head west toward the Sand Tides; this time you must cross through a forest which is the last remnant of Moore Forest and there is a short cutscene where you pay your repects to Galuf at the Elder's Tree. When you enter the Sand Tides there is another short cutscene where you learn that the sand is no longer moving and it's now just plain desert. Continue west; if you keep going you eventually reach Moore Village, but there's nothing new but updated gossip here as well.

Enter the pyramid in the middle of the desert. This time there are two stone statues in front of the door to the pyramid. Check the door to start a battle with them.

When the battle the over, one of the pages from the Sealed Book floats to the door and burns up, thus unlocking the door.

It's a good idea to exit to the desert temporarily at this point to save and heal.