Final Fantasy V/Library of Ancients

Ancient Library
With the wall destroyed, you are free to advance to the ancient library to the south. It is a long detour, and there is a desert containing dangerous monsters in the route, but as long as you stick to grasslands, it shouldn't be too dangerous. When you reach the library, you will need to find Mid, who entered the lower floors of the library to reach a book.

The ancient library is currently filled with sages trying to study the books in the library. It is a place of free healing, with a pot restoring reviving players and restoring them to full health.

Monsters in the library are pages of a book. They are naturally vulnerable to fire.

Enter the door to the basement; there are five major rooms.
 * In the first room, approach the wall to move it to the right. Enter the northwest alcove to make it move back left.  Go through the shelf and climb above it.  Move to the right end and have the shelf move again.  Head to the marked floor tile and use it.
 * In the second room, the right path leads to Ether. The left proceeds further in the dungeon.
 * In the third room, climb the ladder to reach Ifrit and gain its power. The left path leads to the Stealth Robe item.  Once Ifrit is defeated, you can proceed to the other door to get past the blocking bookshelf.
 * The right path leads to a dead-end. Going left and down allows you to retrieve a Phoenix Down.  The other path leads to the next room.
 * In the last room, go past the bookshelf by climbing both ladders. When you reach the lower-right ladder, you open a path, but a book pops out and attacks.  You should find a save point before the boss fight with Biblos.

After defating Biblos, you should find Mid. After a short discussion, he will head to Karnak.

Steamship
Return to Karnak, and go to the second floor of the pub. When you speak with Cid, a cutscene will commence, where Mid will encourage Cid to assist with the steamship (along with flashback from Galuf). Once the steamship is operational, Cid and Mid will return to the ancient library. While you are free to explore the ocean, Mid is studying a book about a cresent island to the southeast.

Cresent
When you enter this island and the city, the first civilian will panic from an earthquake. When you exit the city (and there's not much else you can do now), you will see your ship sink. When you return, Cresent is back to normal. There are a few new weapons and items, which are meant for upcoming jobs.

The bard's house is located in the south-east corner. He can teach you a few songs, such as the "Life Song". You can also use the piano from this location as well.

The Inn also contains a man that mentions the Black Choboco, located in the forst to the south. To catch him, you need to set Butz to use the Thief job, or otherwise give the Dash ability. After catching the Choboco, he will first have trouble flying, but it's discovered that he swallowed two crystal shards. You will now have the Bard and Hunter jobs.

With the Black Choboco, you can head to Lix, Butz's home towm, or return to Cid to continue the main quest. Cid will report they found King Tycoon, who was entering the Quicksand Desert.

Quicksand desert
When you first enter the quicksand desert, you can only get as far as the entrance when the sand pushes you back. If you already spoke to Cid about King Tycoon, he will help attract the sand worm, who will bridge the entrance.

Unlike what Mid gives as advice, the Sandworm can be attacked with Physical attacks or magical (but if you choose magic, retreat after killing it and use a tent.) It only uses a weak attack, but it constantly jumps from hole to hole, and attacking an empty hole will cause a counter attack that halves the health of a target.

Ruined City
There's no monsters in this section, giving some breather time from the difficult quicksand desert.

Approach the stairs in front - when you do, you will spot King Tycoon. He will flee to the east. Give chase, and he will head to the north. To catch up with him, head to the center building just past the stairs. When you approach, a trap door will bring you to an underground area.

After landing, continue left and go through the door. The platform will make a one-way teleport to an underground area beneath Cresent island. When you exit the destination and climb the stairs, head to the south and push the lever at the bottom of the room. This will send you on a short scavenger hunt, where you need to check the plants in the center room, the paper on the right, and the pot in the left room. After reading the book, you can retrieve two Shurkiens and the Size spell.

Return to the stairs, and head north by pushing the lever. Continue along past the Steamship (which you can visit if you want), and to the Airship. It will launch once you speak with Cid inside the ship itself. After it launches, speaking with Cid will alert you to the ship being pulled down: Crayclaw will attack.

Crayclaw is a Level 48 boss with 2000 HP. It first attacks with Tailscrew, which reduces a target to 1HP. However, it is vulnerable to thunder, and should not take more than three hits from Bolt2. When it is defeated, the skys are now yours for good.