Fiend Colony

When you first enter, you'll find a chest with an S-Bomb and also get some instructions on how to navigate this dungeon. Weak walls need 5 S-Bombs (or 1 M-Bomb or L-Bomb) to destroy, medium walls need 5 M-Bombs (or 1 L-Bomb) and strong walls need 9 L-Bombs. You can check to see if a wall can be destroyed by standing next to it. If Yuna's skirt sways as if in a wind, the wall can be blasted.

After blasting through the first two walls (using 5 S-Bombs apiece), you'll come to a cross. Down the right corridor is a weak wall with an Epitaph behind it. Go forward and blast through 2 more weak walls to find a Mega Phoenix.

Go back to the cross and go left. Blast through one weak wall and turn right. On the left side, check for a weak wall that can be blasted. Behind it is a Black Tome.

Go back and forward again. Turn right at the fork (you can see some chests on the right, but ignore them for now). Check for a weak wall on the left that can be blasted. Go through and blast the weak wall in the center of the passageway to find a White Tome.

Go back and keep going right. Blast through a weak wall and then follow a jog to the left. Blast through a medium wall to find an Elixir.

Go back all the way to where you saw the chests. They're all empty, but you can blast the weak wall behind them. Go to the end and blast the weak wall on the left. Turn right to find yourself looking down a long hallway.

Check the right-hand wall for a medium wall to blast through. Blast through a weak wall at the end of the revealed tunnel to find a Elixir.

Back in the long hallway, a short ways forward there's a weak wall on the left. The chest behind it just contains fiends. A little ways further is a medium wall with a weak wall behind which is hiding another Epitaph.

Back to the hallway and just a few steps forward on the left is another weak wall. Behind it is a Mega Phoenix.

Continue further down the hallway and blast a medium wall on the left to find a Elixir. At the very end of the hallway, blast a weak wall on the right and another weak wall to find another Epitaph.

Backtrack a little down the hallway checking the right side for a medium wall. At the end of this passage is a strong wall. Blast through it to come to another 4-way cross. Before going forward, blast the weak wall on the right side before you reach the cross to find a Sword Tome. Blast the walls around this area to obtain gil or random items of which one may be a Bushido Tome or a Nature's Lore.

Turn left at the cross and then right. Blast through a weak wall to find a Turbo Ether. Go straight through the cross and blast a weak wall to find a Epitaph.

Turn right at the cross, go past a left-hand passage and take the next. Blast the weak wall there and continue on. Go forward, jump over a pit and blast a weak wall to face another Epitaph.

Backtrack and jump over the pit on the left. Blast the weak wall on the right for an Arcane Tome.

Jump across another pit and then blast through a weak wall then a strong wall. Behind it is King VERMIN!. Defeating it nets you the Font of Power grid and teleports you back outside.

Walkthrough: