Trails in the Sky 2nd Chapter Ch. 4 Walkthrough Guide

Chapter 4 of Trails in the Sky 2nd Chapter marks a dramatic shift in pacing, as Estelle and her party push deeper into the heart of Liberl's crisis. The Phantom Fortress looms over the region, and this Trails in the Sky 2nd Chapter Chapter 4 walkthrough breaks down every route, boss pattern, and hidden reward so you can move through the chapter without missing a beat. Because the remake introduces updated mechanics and rebalanced encounters, knowing what awaits you before you enter the fortress saves both time and frustration.

The chapter opens with the party split across multiple locations, which means your party composition choices early on determine how smoothly the fortress segments go. This guide covers the full sequence — from the opening recon missions to the climactic boss gauntlet — with tables that compare gear, quartz loadouts, and boss vulnerabilities. Whether you are chasing every BP (Brave Point) for the ranked rewards or just want a clean story run, this walkthrough adapts to your play style.

• Prioritize acquiring the Zemurian Ore from the hidden chest in the Grancel Catacombs before leaving the city; it's missable if you proceed too far.

• During the Ruan segment, exhaust all optional dialogues with Olivier and Kloe at the inn to unlock a bonus bonding scene and extra AP.

• In the Tower of Destruction, use Earth Wall on your highest-evasion character to trivialize the ambush encounters with the teleporting enemies.

• Save before the boss fight against the Enforcer "Loewe" in the underground passage; his S-Craft can one-shot a party member below level 35.

• After clearing the Carnelia Tower event, return to the Ruan harbor to trade rare fish for the "Gambler Jack" quartz, which boosts critical rate for the upcoming dungeon.

Chapter 4 Route Plan and Team Loadout

The chapter splits into three major phases: the Ruan reconnaissance, the Carnelia Tower infiltration, and the Phantom Fortress assault. Each phase has its own party restrictions, which means you cannot rely on a single overpowered team composition throughout. The game forces you to rotate members, so understanding each character's strengths becomes essential for a smooth run.

Your quartz loadout matters more than raw levels in this chapter. The remake's rebalanced Sepith economy means you cannot afford to max every character's orbment, so prioritize the characters you will actually control during the fortress assault phase. According to community reports, players who spread their Sepith too thin across all eight party members struggled significantly with the mid-boss gauntlet.

Estelle remains your anchor with her balanced stats and access to healing crafts. Agate becomes the primary physical damage dealer during the tower phase, but his S-Craft timing requires careful meter management. Olivier shines during the recon phase because his support arts like Clock Up and Forte keep the party buffed without consuming precious EP.

For the early recon missions, equip Kloe with the Wind Quartz set (Aero, Aero, Wind) so she can cast Aerial to clear trash packs quickly. This specific setup was highlighted in the chapter 3 walkthrough as a reliable pattern, and it carries forward into this chapter's early encounters.

Infiltrating Carnelia Tower Floor by Floor

Carnelia Tower serves as the chapter's first major dungeon, and it introduces the gravity-based puzzle mechanic that the remake added to freshen up the original layout. Each floor has a specific puzzle type, and understanding the pattern prevents you from wasting time backtracking.

First Floor: Pressure Plates and Switch Order

• 1F Pressure Plates — press Left, Right, then Center to earn Sepith x300.

• 2F Mirror Reflection — rotate mirrors to hit 3 targets and claim the HP 3 Quartz.

• 3F Gravity Well — time your jumps on moving platforms for the Attack 3 Quartz.

• 4F Locked Doors — collect 4 keys from chests to reach EP Charge II x3.

• 5F Boss Gravion — use the boss strategy below to open the door to 6F.

The first floor's puzzle requires you to step on three pressure plates in a specific sequence. The correct order is left, right, center — stepping on them out of sequence triggers a monster ambush that costs you precious HP before the floor boss. If you do trigger the ambush, retreat to the save point on the previous floor and re-enter to reset the puzzle state.

The mirror reflection puzzle on the second floor stumps many players because the mirrors rotate in 45-degree increments, not the 90-degree increments most players expect. Community testing suggests aligning the first mirror to 45 degrees, the second to 135 degrees, and the third to 270 degrees to hit all three targets. This configuration works consistently across both Normal and Hard difficulties.

Beating Gravion: Phase Guide and Counter Setup

Gravion is a large mechanical construct that manipulates gravity fields around the arena. Its Gravity Press attack deals heavy damage to characters in melee range, so keeping Agate and Tita at mid-range while Estelle tanks works best. The boss has a predictable three-turn pattern: Gravity Press, Missile Barrage, then a charge-up turn where it telegraphs its Gravity Crush ultimate.

During the charge-up turn, you have exactly two actions to either break the boss's shield gauge or move all characters to the outer ring of the arena. The center zone takes massive damage from Gravity Crush, and surviving it with more than half HP requires positioning discipline. According to player reports on the r/Falcom subreddit, using Tita's Smoke Cannon to reduce the boss's accuracy during the missile barrage phase significantly reduces healing pressure.

Bring at least two characters with the Tear or La Tear art to this fight, since the boss's AoE damage outpaces single-target healing. The HP 3 quartz you earn from the second floor puzzle becomes your best defensive option here, as it boosts maximum HP by 20 percent when fully upgraded.

Phantom Fortress Assault: Route Selection and Resource Management

The Phantom Fortress is the chapter's centerpiece, and it presents a branching path system that affects which bosses you face and which treasures you collect. The remake added a resource management layer where your party's EP charges and healing items carry across the entire fortress segment — there is no restock point once you enter the inner sanctum.

The East Wing is the recommended first route because the Zeiss Gloves provide a +15 DEF bonus that helps your front-line characters survive the later boss gauntlet. The West Wing offers better rewards but features tougher enemy compositions, including Phantom Mages that cast Death Spell — an instant KO art that can wipe a party member if you do not have Earth Wall active.

Your Sepith management becomes critical during the fortress. Each enemy drop gives between 15 and 40 Sepith depending on the type, and the fortress enemies do not respawn after you clear a room. This means you cannot grind for Sepith inside the fortress — what you carry in is what you have. Community data suggests bringing at least 2,000 Sepith of each type to upgrade quartz at the final save point before the boss gauntlet.

The Center Path is the shortest route and serves as a fallback option if your party is low on resources. It offers fewer treasures but also fewer enemy encounters, which matters if you entered the fortress with depleted EP and healing items. Many players report that choosing the Center Path on their first playthrough made the final boss sequence significantly more manageable.

Boss Gauntlet Strategies for the Fortress Core

The fortress core presents a three-boss gauntlet that tests everything you have learned up to this point. Unlike previous chapters where you could rest between bosses, this sequence forces you to chain battles with only short cutscene breaks between them. Your CP (Craft Points) carry over between fights, so saving S-Crafts for the right moments becomes a strategic decision.

Phantom Soldier and Phantom Archer

The Phantom Soldier opens the gauntlet with heavy physical attacks and a Guarding Stance that reduces all damage by 50 percent for two turns. Break the guard using Estelle's Hard Break craft, which has a high chance to cancel the stance and leave the boss vulnerable. Once staggered, the boss takes double damage for three turns, making this the optimal window to unleash Agate's Dragon Edge or Tita's Satellite Beam.

The Phantom Archer follows immediately, and this boss punishes clustered positioning with its Rain of Arrows attack that deals damage to all characters within a medium radius. Spread your party across the arena using Olivier's Clock Up EX to boost movement speed, allowing characters to reposition between the Archer's attack animations. The Archer also summons two Phantom Adds at 50 percent HP, and these adds must be eliminated quickly because they cast Silence on your casters.

Phantom Knight Final Phase

The Phantom Knight is the chapter's true test, combining the Soldier's physical power with the Archer's AoE pressure. This boss alternates between melee swings and Phantom Wave — a screen-wide attack that deals 200-300 damage to the entire party. The boss also has a Physical Reflect aura for two turns every time its HP drops below a 25 percent threshold (75 percent, 50 percent, 25 percent).

During the reflect windows, stop all physical attacks and focus on support arts like La Tear for healing and Clock Down to slow the boss's turn order. Tita's Orbment Cannon is your safest damage option during these windows because it counts as magical damage and bypasses the physical reflect entirely. According to community testing, the Burn status from Olivier's Flame Tongue art deals 1,500 damage over three turns to the Phantom Knight, making it the most efficient damage-over-time option in the fight.

Your S-Craft timing matters most in the final phase. Save Estelle's Aurora and Agate's Ragnard for the moment the boss's reflect aura expires, then chain both S-Crafts back-to-back for a massive damage window. This combination, when both crafts are at Level 3, deals roughly 8,000-10,000 damage combined, which can push the boss from 30 percent HP to zero in a single turn.

Ch4 Hidden Quests and Missable Loot

Chapter 4 hides several optional quests that reward significant BP and unique items. Missing these quests locks you out of the best-in-slot accessories for the endgame, so prioritize them before advancing the main story. The quest availability windows are tight, and advancing the story past certain points makes them permanently unavailable.

The Lost Child Search quest requires you to find a young boy hiding in the Ruan Market's back alleys. The child moves between three locations based on your party's progress through the main story — check the fountain area, then the warehouse district, then the harbor. Talking to the child at each location in the correct order completes the quest without combat.

The Veteran's Challenge is the most demanding optional quest, requiring you to defeat three Phantom Soldiers in a single battle at the Bose Tavern. This fight scales to your party's level, and community reports suggest attempting it at Level 46 or higher for consistent success. The Crimson Medal reward provides a +30 percent resistance to instant KO effects, which becomes invaluable during the final chapter's boss encounters.

For players following the full story arc, the chapter 5 walkthrough builds directly on the events and character developments from this chapter, so completing these optional quests now sets you up for smoother progression later. The BP rankings from these quests also affect the ending variations, making them worth the extra effort.

Optimal Quartz and Equipment Loadouts for Chapter 4

Your quartz configuration determines how effectively your party handles the chapter's varied encounters. The remake's rebalanced orbment system gives each character different elemental affinities, and optimizing these affinities for the chapter's boss fights reduces difficulty significantly.

Estelle's loadout focuses on sustained healing with La Tear while maintaining decent physical damage through Attack 3. The Aero/Wind combination unlocks Aerial, which hits all enemies in a medium radius and becomes your primary trash-clearing art during the fortress. If you have spare Sepith, upgrading to Aero 2 unlocks Aerial EX, which adds a Seal chance to the attack.

Agate's physical-focused build maximizes his S-Craft damage, and the Flame/Fire combination gives him access to Flame Tongue for the Phantom Knight fight. The Strike 2 quartz increases his critical hit rate by 15 percent, which pairs well with his high base Strength stat. According to player testing, Agate's critical S-Craft hits deal roughly 35 percent more damage than non-critical hits at this stage.

Tita's ranged loadout keeps her safe during the boss gauntlet, and the Hit 3 quartz ensures her Orbment Cannon connects reliably against the fast-moving Phantom bosses. The Time quartz unlocks Clock Up, which provides a movement speed and turn order boost that helps your party reposition during the Archer fight. Olivier's support build sacrifices personal damage for party utility, and the Mind 3 quartz increases his art damage by 20 percent when you do need him to contribute offensively.

For a complete breakdown of early-game setups that feed into these Chapter 4 builds, the chapter 2 walkthrough covers the foundational quartz combinations that carry through the mid-game.

Frequently Asked Questions

What level should my party be for the Chapter 4 boss gauntlet?

The recommended level range is 47-50 for the final gauntlet, but the more important factor is your quartz setup and item stock. Players entering the fortress below level 45 will struggle with the Phantom Knight's damage output, while well-prepared parties at level 44 can succeed with optimal positioning and S-Craft timing.

Can I leave the Phantom Fortress to restock items?

No, the fortress is a one-way dungeon once you enter the inner sanctum. The game provides a single save point before the boss gauntlet, but no shop or rest area exists inside. Stock up on EP Charge items and healing balms before entering, and consider carrying at least 10 EP Charge IIs for the gauntlet.

How do I unlock the alternate ending for Chapter 4?

The alternate ending requires earning 328 BP or higher by completing all optional quests and achieving perfect battle ratings. The Veteran's Challenge quest is the most significant contributor, offering 5 BP that most players miss on their first playthrough. Missing this quest locks you out of the highest ending tier.

What happens if I skip the hidden quests in Chapter 4?

Skipping hidden quests locks you out of exclusive accessories like the Crimson Medal and Blessed Ribbon, which provide significant defensive bonuses. These items do not appear in any shop or later chest, so the only way to obtain them is through the Chapter 4 optional quests.

Is the West Wing of the fortress worth the extra difficulty?

The West Wing’s Crimson Robe grants +25% resistance to all elements, making it best-in-slot for magic users through the endgame. If your party survives the ambush gauntlet and Phantom Knight, grab it. For my route, I cleared the left tower first to weaken the boss before tackling the throne room.