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Locate Sealed Cave[edit]

FF4 WT 10a.jpg

To the south in the underground is a cave which is completely surrounded, and can only be entered from above. This is the sealed cave, so land the airship and enter the cave.

Note: if you already obtained the Dark Crystal by having Rydia cast Warp in the Dwarven Castle throne room, you do not have to complete the Sealed Cave. This only works in the SNES version.

It would be prudent to carry at least 15+ Phoenix Down/Life items into this dungeon, just in case.

Enter the Cave[edit]

Sealed Cave
Number Name HP Weakness Resist Absorb Gil Exp Notes
#123 Vampire Bat 1014 Fire, Thrown - - 355 2306 -
#124 Lesser Marilith 1400 - - - 205 3082 Handled easily with Poison Axe
#125 Nagaraja 1480 - - - 238 3582 -
#126 Vampiress 2375 Fire, Holy - - 188 3582 -
#127 Yellow Dragon 3100 - - Lightning 1500 28000 Counters with Lightning; Vulnerable to Tornado; Drops Silver Apple; Summoned by Trap Door
#128 Chimera Brain 3400 - - Fire, Ice, Lightning 1200 28000 Summoned by Trap Door
#129 Trap Door 5000 - - - 4500 30000 Can be countered with Reflect
FF4 WT 10b.jpg
Sealed Cave Checklist:
  • Kotetsu x2
  • Lustrous Sword
  • Black Cowl
  • Ether x3
  • Bestiary x2
  • Hi-Potion x2
  • Phoenix Down x2
  • Light Curtain
  • Fuma Shuriken
  • Elixir
  • Silent Bell
  • Dry Ether
  • X-Potion

When you enter the cave, approach the door. Use the Luca key (necklace) on it and it will be unsealed. In the next room follow the path all the way around the room, until you reach the second door in the room. Like almost every door in the cave, this door is a trap, and you will have to fight it in order to pass through.

Trap Door[edit]

FF4 WT 10c.jpg

Trap Doors attack using a combination Target, then Ninth Dimension. They will first use Target, then about 2 rounds later they will use Ninth Dimension which will automatically kill that member of your party. If you have not defeated the Trap Door past a certain point, it will change into another monster, which you will have to defeat also in order to pass.

Many Doors[edit]

FF4 WT 10d.jpg

In the next room you can ignore all the doors, and continue into the next room. In this room, go to the right, then up and you will reach a long stretch with many trap doors. None of them are necessary to continue, but some contain chests, and one has a save point. Continue past them to the door at the bottom left of the room to continue through the cave.

Keep Moving[edit]

FF4 WT 10e.jpg

The next two rooms are small, continue through them, ignoring the trap door in the second room. In the large room you next reach, cross the rope in the center of the room, then go to the left and down the staircase.

Save Point[edit]

FF4 WT 10f.jpg

Use the savepoint in the next room, then continue on. The next room is a large circle. Ignore the ropes and go all the way around the edge and down the stairs in the middle. In this room you will see a bridge with one final trap door. Enter it and defeat it.

Boss: Demon Wall[edit]

Number Name HP Weakness Resist Absorb Gil Exp
#224 Demon Wall 28000 - - - 8000 2300
FF4 WT 10g.jpg

Retrieve the crystal, and attempt to leave the cave. When you try to cross the bridge, you will be interrupted by another trap. This one is a Wall that will move toward you as you attack, using a devastating move called Crush if it reaches you. You must defeat it as quickly as possible. Cast Berserk on Cecil and Edge (and maybe Kain), and have Rydia cast Virus/Bio. If you're not fast enough, when the wall closes in it will begin using Crush spell on a random party member. You can use items or spells to revive that member and continue the fight.


FF4 WT 10h.jpg

Now you can leave the cave (Exit and Warp will not work so you have to walk). Just as you are about to exit the cave, Kain will steal the crystal and leave your party. After this occurs, leave the cave and fly back to the Gnome City.

Visit Cid[edit]

FF4 WT 10i.jpg

First, go visit the king, and he will tell you that you must return to Mysidia to get the ship necessary to fly to the moon. Cid will enter the room then attach a drill to your airship. Finally, get in the airship and go to the circle in the northeast part of the underground, place your airship above it, then press the button to land, and you will drill your way out of the underground.

Optional Sidequest[edit]

If you have finished the Passage of the Eidolons and unlocked Asura and Leviathan as a result, this would be a good point to attempt the Odin sidequest, as well as starting the first half of the Excalibur Sidequest. Now that you have access to both the overworld and underworld, you can also get the Sylph summon if you have finished the Sylph Cave.

Bestiary Roundup[edit]

FF4 PSP strip.jpg

On the far South-West wall of the underworld is a strip of land 3 tiles long, where a few rare enemies can be encountered.

Three Step Strip
Number Name HP Weakness Resist Absorb Gil Exp Notes
#075 Blood Flower 370 Fire - - 445 703 -
#084 Gloomwing 1580 Thrown Magic - 510 2837 -
#085 Gorgon 2550 - - - 248 3003 -
#086 Mystery Egg ? ? ? ? ? ? ?
#091 Medusa 490 - - - 225 1208 -
#093 Coeurl 593 - - - 345 2759 Counters with Blaster
#107 Stone Golem 2560 Ice - - 238 2908 -
#132 Hornworm 1855 - - - 538 3437 -
#137 Alraune 2315 Thrown - - 598 2744 -