Finishing the Trails in the Sky SC final chapter is all about managing the collapse of orbal technology while storming the floating city of Liber Ark. With the Arseille finally airborne, your goal is to infiltrate the core of Ouroboros’s operation and stop the Aureole project before it’s too late.
It is easy to get turned around in the labyrinthine design of the floating city, especially when you hit dead ends that require specific keys. I personally spent way too much time wandering the Industrial District looking for gates that I hadn’t activated yet, so pay attention to your terminal prompts.
Before you dive in, make sure you have fully upgraded your party’s Quartz setups, as the boss battles ahead are unforgiving. Stock up on recovery items and ensure your team has a mix of offensive crafts and defensive buffs ready to go.
For deeper mechanical insights, consult the official game documentation provided via the digital manual.
Navigating the Aureole
After the crash landing on Aureole, disembark from the Arseille and follow your objective marker to enter the city. The layout is confusing, so stick to the path markers to avoid unnecessary detours.
Locate the elevator ahead, which transports you to a Halo Rail station. These are your fast-travel points and shops, so activate the rail immediately and check the terminal to unlock the surrounding security gates.
Head back down in the elevator to reach the previously sealed path. This opens access to Liber Ark Underground Tunnel 1.
Ignore the locked gate you encounter inside the tunnel for now. Keep pushing toward the marker until you are ambushed by monsters, which you will need to clear to proceed.
Finding Josette
Once you surface in the Residential District, follow your map to locate Josette. She is currently stranded and needs your help dealing with nearby hostiles.
Clear the enemies surrounding her to trigger a cutscene where she reveals her fellow Sky Pirates are being held hostage. Josette will officially join your roster as a playable character after this encounter.
Obtaining the Genuine Gospel
Head to the Cradle Hall following the quest indicator. Inside, you will find a device that requires a specific sequence of inputs to activate.
The solution is tied to the Data Crystals you gathered from the Tetracyclic Towers. If you are stuck, return to the Arseille and use the terminal in Professor Russel‘s factory to decrypt the hints.
Ensure Kloe is in your active party, as she is required for this sequence. When prompted by the terminal, select the input related to Celeste D. Auslese.
In the selection menus, choose Celeste for the first, D. for the second, and Auslese for the third. Completing this sequence grants you the Genuine Gospel.
Leave the hall and find the elevator in the Residential District. This takes you directly to the Cradle Station.
Activate the Halo Rail here to enable fast travel. Stand near the station terminal and select the option to insert the Gospel, which clears the nearby blockade.
Take the elevator down and move through the now-open gate into the tunnel system. This path leads deeper into the city.
Follow the marker through the tunnels until you reach a large cavern area. Be prepared to fight another wave of combatants before you can move on.
The Industrial District
Emerging from the tunnel brings you to the Industrial District. Here, you will find the Glorious, the massive airliner owned by Ouroboros.
Make sure Josette remains in your party, as you cannot move forward with this section without her presence.
Boarding the Glorious
Before boarding the Glorious, you must defeat a group of Enhanced Jaegers and Archaism units guarding the ramp.
Once inside, navigate to the lower decks to find Josette’s brother and the other captive pirates. You will notice they are trapped behind a locked gate that requires further effort to open.
Retreat to the entrance and find the elevator leading to the Stern 1st Level. From there, locate the stairs leading to the roof.
Upon reaching the roof, you are forced into a battle against three Pale Apache Archaisms. Defeating them triggers a secondary phase where you must fight the remaining Spindolls.
Arseille Defense
The perspective shifts back to the Arseille, where Captain Julia and Major Vander lead the defense. Before initiating this sequence, double-check that their Quartz and equipment are optimized for a hard fight.
You will face two successive waves of enemies attempting to board the ship. Since Julia is a powerful unit, utilize her strong arts to make short work of these attackers.
Retrieving the Security Card
Return to Estelle’s perspective after the defense successfuly repels the attackers. Traverse the hall to find the elevator on the opposite side.
Use the elevator to ascend to the Bow 2nd Level. Search the various rooms here until you find a treasure chest containing the Security Card.
While backtracking to the pirate cells, you will be intercepted by Gilbert. He will deploy a formidable Riot Arms unit to fight alongside him.
Take out Gilbert first to remove his support, then focus your heavy attacks on the Riot Arms. Clean up the rest of the enemies to clear the path.
Reach the cell block and use your new Security Card to unlock the doors, successfully freeing Josette’s brother and the others.
Be careful: unlocking cell No. 1 progresses the narrative immediately. Ensure you have finished everything else you need to do in this area before proceeding.
Clearing the Underground Tunnels
With the pirates safe, you switch to Julia and Vander once more. Your goal is to identify the source of the Archiasm attacks plaguing the Arseille.
Use this opportunity to grind some experience points from the enemy density in the tunnels. Follow the quest markers to move toward your destination.
You will encounter a Black Centaur Archiasm alongside several Mirror Flaggers. Keep in mind that Mirror Flaggers grant buffs to their allies upon death, which makes the fight significantly harder if you aren’t prepared.
One enemy constantly uses Reflect, so be ready to use Anti-Sept All or similar crafts to strip those buffs away. Defeating these mobs returns the story to Estelle.
Activating the ORPHEUS Terminal
Return to the Bobcat ship and speak with Kyle. He will mention hearing the word ORPHEUS, which serves as your next critical password.
Go to the elevator in the Industrial District to access the Factory Station. Use the Gospel at the console and input ORPHEUS when the prompt appears.
The gate will unlock, granting you access to Liber Ark Underground Tunnel 3. Proceed through the tunnel to reach the far side of the city.
You will emerge in front of the Axis Pillar. Make sure you activate the nearby Halo Rail station to establish a permanent shortcut.
The Axis Pillar Ascent
Before storming the Axis Pillar, return to the Arseille to swap your team. You can now recruit Julia and Vander, which helps tremendously given that certain Enforcers require specific party members for narrative reasons.
You must defeat a Riot Claw before the game allows you to enter the pillar. Once it is down, you are ready to begin the final ascent.
First Floor Boss: Bleublanc
On the first floor, you face Bleublanc. Unlike earlier encounters, he starts by summoning clones, which can overwhelm you if you don’t focus fire. He is also supported by several Archaism units, so manage your crowd control abilities wisely.
