Enemy list
Chest list
With all four crystals restored, you can now enter the final dungeon. Before visiting, stock up on items and make sure you have the best equipment and spells ready.
Getting to Chaos Shrine
Continuing from the previous chapter, board your airship and fly to Chaos Shrine.
Chaos Shrine
The Chaos Shrine is five floors deep (and five basement floors after that). There are 7 treasure chests to collect for the Legendary Treasure Hunter trophy. Watch out for Mindflayers, Death Knights, and Iron Golems; they hit hard. You're free to leave anytime. The bosses won't respawn after you defeat them; if you need to head outside and use a Cottage, do it. Check the bestiary for enemy weaknesses.
Head into the room where you defeated Garland. Interact with the blue orb to travel back 2000 years.
1F. Exit the room and take an immediate right. Go north through the pillars heading east, then south to the southeast corner for the stairs to 2F.
2F-3F. On 2F, take a right and climb up to 3F. Go south, take the final right, and follow the pillars north into the guarded room. Grab both chests and interact with the object in the center; a ladder appears leading back to 2F. Exit the room, take the first left, follow the columns north to find stairs in the top-left corner.
1F (Return). Head west and take the stairs in the top-left corner down to B1.
B1: Lich
Wind around the outer edge, ignore the pathway with the pillars and continue east. Take the path south and you'll come across a yellow orb. It's actually Lich, one of the four Fiends, but an upgraded version. Heal up and save before attempting this.
B2: Marilith
Exit the room, take a left and from the pillars take a path north into a room. Take the first immediate right and then the third path south (if you see the statues, you're going the right way). Continue south and take a left into the pillars. You'll see a red orb but we're going to skip it for now to collect the chests on this floor.
Take a path south and take the left door. You'll immediately see a chest in front of you. After picking it up, go south and take a left to reveal another door. Continue to the end and go south to the first room. Now return the way you came to the first of the two doors. This time you'll be going through the opposite door and repeating the same process of collecting the chest and following the path to another chest.
Return to the red orb for another big fight (save and heal). This time you'll be fighting an enhanced Marilith.
B3: Kraken
Go through the door and exit the other. Stay south and take the first door on your left. Follow the path around until you reach three inscribed stones and go south. Take the first right and you'll come across a blue orb: Kraken.
B4: Tiamat & Masamune
Take the path going south, and south again. Take a right and then the first right. Go south, take a right and follow the zigzag path. You'll reach a room containing the strongest blade in the game: the Masamune. Return the way you came to the top left corner, but this time take a right and follow the path to the final Fiend, Tiamat.
B5: Chaos
Circle around the room and enter from the south. You're about to face the final boss in this game, who just so happened to be the first boss. He'll tell you how he was sent back 2000 years in the past by the Fiends when he died, and then sent them forward 2000 years (these were the Fiends you defeated before). There's an endless loop you need to destroy.
Restore everyone to full health. Drink as many Ethers and Elixirs as it takes. Equip everyone you can with Ribbon. Have Excalibur and Masamune ready for those who can wield them. Save when you're ready.

When Chaos falls, the time loop shatters. The paradox that trapped the world for 2000 years finally ends. Watch the ending. Your Warriors of Light completed their destiny. The crystals are restored. Peace returns to the world. Congratulations - you've beaten Final Fantasy 1.