Before we head to our final destination, let's pick up the second strongest weapons for our fighters.
Mount Duergar
Take your airship and fly to Mount Duergar. Enter the top room and talk to the blacksmith inside, he'll forge a sword Excalibur for you.

Equip on your fighter immediately then leave the cave.
Chaos shrine
Next is our final dungeon, Chaos Shrine. Head inside the middle room and examine the crystal.

Bestiary checklist:

1F: Leave the room, the exit is in the bottom-right corner. The one in the bottom-left leads to a dead-end.
2F: Take the staircase on your right to 3F.
3F: Head south, then east, enter the room in the middle. There is a monster blocking the door. Kill the monster then pick up 2 items:
- (C-243) Dry Ether: Left chest.
- (C-244) Elixir: Right chest.
Examine the middle stone to open a new exit.
2F: Leave the room and take the exit in the northwest corner to 1F.
1F: Go straight west to another exit in the northwest corner.
Chaos Shrine - B1
From here on, you'll have to fight a boss (the four fiends) on each floor until B5.
Go up, right (don't take the split path), down, until you see a yellow orb. Examine the orb to fight a boss.

Boss: Lich (2800 HP)
Use "Haste" and "Temper" on the damage dealers. He is also weak against Fire and Dia.

- (C-245) Protect Ring: Left room.
- (C-246) Sasuke's Blade: Second bottom room.
- (C-247) Protect Cloak: Right room.
- (C-248) Elixir: Second right room.
Boss: Marilith (3400 HP)
Use "Haste" and "Temper" on the damage dealers, then cast blizzard-based spell.

This time, Kraken is protecting the exit.
Boss: Kraken (3600 HP)
Just use "Haste" and "Temper" on the damage dealers, it's a relatively easy boss.

- (C-249) Masamune: Strongest weapon in the game.
Backtrack to the exit at the top-right area.

Boss: Chaos (20000 HP)
Just give everything you got. If you got Black Mage, use "Haste" + "Temper" + "Temper" on your Fighter, it'll give a very nice boost.
Congratulations, you've completed the game. If you haven't completed your bestiary, go the bestiary page for the full list of monsters and their locations.