Introduction: Zenless Zone Zero Mystery of Arpeggio Fault Guide

Mystery of Arpeggio Fault is a permanent event from Zenless Zone Zero’s 1.3 update, part of the Ridu Chronicles, where players join the New Eridu Defense Force in securing a route through the perilous Arpeggio Fault to reach the old capital. Through challenging missions, players battle Hollows, uncover secrets, and help stabilize the region—earning Polychromes, upgrade materials, and other valuable rewards along the way. Combining story progression with meaningful gameplay, this event is a key feature for both newcomers and veterans alike.

Mastering the Tech Tree

The Tech Tree plays a vital role in your success within the Mystery of Arpeggio Fault, allowing you to enhance your squad’s capabilities and tailor your approach to exploration and combat. By spending Crimson Silk, earned through HDD exploration, you can unlock nodes within the Tech Tree, boosting your damage output, survivability, and utility. As you progress deeper into the fault, additional nodes become available, granting even more customization options to optimize your loadout.

Additional Tech Buffs Worth Considering

Explosive Supplies

While primarily useful for an easter egg, this perk also provides a small advantage by giving you starting bombs, which can help in early encounters.

Resonia Collection

Grants a chance to spawn a resonium tile after defeating an enemy. This can be useful for maintaining energy over extended runs.

Bonus Supply

Increases the chance of generating a chest upon picking up a key, offering additional loot that may prove beneficial during exploration.

By strategically investing in Tech Tree upgrades, you can maximize your efficiency, improve survivability, and tailor your approach to clearing the Mystery of Arpeggio Fault with greater ease.

Key Tech Tree Buffs to Prioritize

Body Empowerment – One of the most powerful upgrades, this perk provides free starting health upon entering each floor. Since the first floor entry after selecting support agents counts towards this bonus, it effectively grants extra HP at no cost. Additionally, this perk stacks, allowing you to begin runs with a significant health advantage.

Economic Improvement – A strong pick that enhances your resource management. This perk works particularly well if you rely on Nicole, who is widely regarded as one of the best support characters. The shop is crucial in this mode, offering resonium, experience, and healing items, making this perk highly valuable.

Experience Absorption – This tech boosts your XP gain, allowing your squad to level up more quickly. Faster leveling translates to increased stats and abilities, making it easier to handle tougher enemies and challenges within the fault.

Medical Facility – A survival-focused perk that provides a chance to spawn a health recovery tile when taking damage. This can even trigger from environmental hazards, such as spikes, effectively turning them into a way to generate free healing.

Data Files (Sub-Strategies)

Before setting off on an expedition in the Mystery of Arpeggio Fault, selecting a Data File is crucial, as it provides valuable buffs, items, and gameplay advantages that shape your playstyle. These level-up bonuses are earned by accumulating XP, allowing you to further refine your approach as you progress through each area. Choosing the right Data File can significantly impact your efficiency, resource management, and combat effectiveness.

Recommended Data Files

Deep Pockets

Ideal for players who rely on frequent shop interactions, this Data File works particularly well with Nicole, allowing for better resource acquisition and economic management. With Nicole’s skillset, this bonus enhances your ability to purchase key upgrades, healing items, and resonium, making runs more sustainable.

Team Up

Designed to boost synergy between certain characters, this Data File is especially effective when used with Koleda and Ben, enhancing their team-based combat capabilities. If your strategy revolves around these agents, this Data File strengthens their combined potential.

Battle Expertise

A solid early-game pick, this Data File provides a general combat boost, making it useful before unlocking more specialized builds. It helps smooth out the initial floors, ensuring a stable start.

Exp Build-Up

Best utilized in Zone 4, Laboratory Ruins, where it significantly enhances XP gain. This allows your squad to level up more efficiently, helping you reach power spikes earlier in the expedition.

Demolition Squad

Focuses on bomb-based strategies, offering extra resources and synergies for explosive-heavy builds. While not always a go-to option, it can be surprisingly effective when properly utilized.

By selecting the right Data File, you can tailor your expedition to suit your preferred playstyle, optimize your resource management, and gain an edge in combat encounters throughout the Mystery of Arpeggio Fault.

Support Agents (Companions)

As you progress through the Mystery of Arpeggio Fault, you can unlock additional agents and expand your squad size by earning Contribution Points from defeating enemies. These agents provide unique abilities and playstyles, allowing you to optimize your strategy based on your preferred approach. Choosing the right agents can significantly impact your effectiveness in combat, resource management, and overall expedition success.

Agent Overview

Nicole

A top-tier pick due to her ability to scale attack power based on gear coins collected, making her an essential damage dealer.

Nekomata

Generates 100 gear coins per attack, making her an excellent support unit for Nicole, significantly boosting resource gain.

Koleda & Ben

When used together, Koleda’s attacks become guaranteed critical hits, while Ben has a 50% chance to drop a b*mb upon attacking, offering high burst potential.

Yanagi

Increases XP gain, helping accelerate squad leveling and unlock stronger abilities faster.

Corin

Gains +1 attack per attack, allowing her to continuously scale damage over multiple encounters.

Solider 11

Starts with high attack power, but cannot increase attack further, making her a strong early-game agent but lacking long-term scaling.

Caesar

Has a 50% chance to reflect damage when hit, providing a defensive advantage against enemies.

Anby

Possesses a 20% critical hit chance, adding a consistent damage boost throughout the expedition.

Anton

Can continue attacking even after HP drops to 0, but loses 1 ATK with each subsequent attack, making him a risky but persistent fighter.

Billy

Suffers a -15 ATK penalty after the Protagonist takes damage for the first time, limiting his effectiveness in prolonged engagements.

Lighter

Gains +20 attack when the Protagonist’s HP is below 20, making him a high-risk, high-reward choice.

Unlocking and upgrading the right agents will define your playstyle and determine how efficiently you progress through the Arpeggio Fault. Experimenting with different team compositions can help maximize combat efficiency, resource gain, and survivability.

Unlocking the Mystery of Arpeggio Fault

To begin your journey into the Mystery of Arpeggio Fault, you must first prove your combat prowess by completing the “Qualification Assessment: Edge” within Hollow Zero. This trial serves as a benchmark to ensure you’re ready to take on the dangers that lie ahead. Once you’ve successfully cleared the assessment, head to Scott Outpost, a strategic base situated near the entrance to the Arpeggio Fault. There, you’ll meet Roland, a key figure overseeing the expedition.

Speaking with him will provide you with crucial background information, as well as your first set of objectives for the mission. From this point, you’ll be tasked with assisting the New Eridu Defense Force in establishing a stable presence within the fault, battling powerful adversaries, and uncovering the deeper mysteries hidden within this hazardous zone.

Gameplay Mechanics

The core gameplay loop of the Mystery of Arpeggio Fault revolves around navigating a series of interconnected maps, uncovering hidden exits, and strategically engaging enemies along the way. Your journey spans five distinct areas, each consisting of multiple floors filled with obstacles, enemies, and valuable rewards. Combat takes place through a TV monitor interface, where you control a squad of Bangboo, led by Soldier 11, to battle the Ethereal threats lurking within the fault.

Encounters with enemies follow a straightforward but tactical approach—colliding with an Ethereal initiates an automatic damage exchange. The amount of damage inflicted is based on your squad’s attack stat, and if your attack power exceeds that of the enemy, you take no damage in return. This system emphasizes careful squad development and stat optimization to ensure smoother progression.

Advancing through the Arpeggio Fault requires continuous enhancement of your squad. Defeating enemies and clearing floors grants experience points (XP), leading to level-ups that provide stat boosts and perks based on your selected Sub-Strategies. Additionally, Crimson Silk, earned from expeditions, can be invested into the Tech Tree, unlocking permanent upgrades, abilities, and strategic advantages to aid in future runs.

While rushing to the exit is an option, thoroughly exploring each floor can yield substantial benefits. Taking the time to investigate all available paths and challenges can reward players with bonus resources, rare items, and additional Polychromes, making full exploration a worthwhile endeavor. Balancing efficiency with exploration is key to mastering the Mystery of Arpeggio Fault.

Meta Builds

To maximize your effectiveness in the Mystery of Arpeggio Fault, selecting the right team composition and Data File can significantly improve your performance. Certain meta builds take advantage of powerful synergies, ensuring efficient resource management, damage output, and survivability.

Recommended Meta Builds

The Nicole Build – This team consists of Nicole, Nekomata, and Soldier 11, leveraging Nicole’s attack scaling with gear coins. Nekomata plays a crucial support role by generating 100 gear coins per attack, ensuring that Nicole consistently increases her damage output. Soldier 11 provides a strong early-game presence with her high base attack, making it easier to clear initial floors efficiently. The ideal Data File for this build is Deep Pockets, which enhances shop interactions, allowing for more gear coin utilization and optimal resource purchases.

The Koleda and Ben Build – This composition features Koleda, Ben, and Corin, taking advantage of their strong synergy in combat. Koleda’s attacks become guaranteed critical hits, ensuring consistent high damage output, while Ben has a 50% chance to drop a b*mb upon attacking, adding explosive area damage to encounters. Corin complements the team by gaining +1 attack per attack, allowing for steady damage scaling throughout the expedition. This build benefits from the Team Up Data File, which enhances team synergy, further amplifying their combat potential.

Choosing the right build and Data File ensures a smoother progression through the Arpeggio Fault, making encounters more manageable and increasing your chances of completing deeper floors efficiently.

Farming Crimson Silk

To efficiently farm Crimson Silk and unlock valuable Tech Tree upgrades, focus on Area 4: Laboratory Ruins, where you can maximize your resource gain per run. The Crimson Silk cap per run is set at 5000, so optimizing your farming strategy ensures you reach this limit efficiently.

Optimal Farming Setup

Recommended Team:Nicole, Nekomata, and Yanagi

Nicole benefits from gear coin generation, scaling her attack as the run progresses.

Nekomata generates 100 gear coins per attack, further enhancing resource collection.

Yanagi boosts XP gain, allowing for rapid leveling and increased squad strength.

Recommended Data File:EXP Build-Up

Helps accelerate leveling, ensuring you reach max level quickly for better performance in combat and higher farming efficiency.

Best Locations:

58F (third level) and 64F-A (fifth level) within Laboratory Ruins are ideal farming spots, offering high XP gain and valuable resources.

Farming Strategy:

Utilize Yanagi’s XP boost to reach max level quickly.

Prioritize Coin Collection to increase gear coin earnings, enhancing Nicole’s attack power.

Maintain a steady pace, ensuring efficient resource gathering while aiming to hit the 5000 Crimson Silk cap.

Key Resonium to Prioritize:

Standard Power Medicine – Increases sustainability, ensuring your squad remains healthy for longer runs.

Ben’s Strength – Enhances attack power, making it easier to clear enemies quickly.

Antique Pocket Watch – Boosts turn efficiency, allowing for more strategic moves per floor.

Hollow Robot – Provides additional utility effects, improving your overall survivability and efficiency.

By following this farming setup, you can maximize Crimson Silk gains, accelerate Tech Tree progression, and optimize your squad’s strength, ensuring smoother and more efficient runs through the Mystery of Arpeggio Fault.

Navigating the Areas.

Each area within the Arpeggio Fault presents unique challenges, rewards, and hidden secrets that can significantly impact your progression. Understanding the key mechanics and items within each zone will help you navigate more effectively and unlock additional bonuses.

Area Breakdown and Key Elements

Fault Surface

Collect essential resources like bombs, Crimson Silk, and Keys to aid your progress.Look out for the Fruit Peeler Resonia, which provides valuable buffs.

Look out for the Fruit Peeler Resonia, which provides valuable buffs.

Locate the Dampened Ether Explosive, a useful tool for dealing with obstacles.

Discover password clues—the first letter (C) and sixth letter (B) of the final password.

Be wary of RIP TVs, which can hinder your movement and disrupt progress.

Acquire the Photo of the Turbulent Region, an important lore-related item.

Old Observatory

Gather keys, bombs, and Crimson Silk while exploring this zone.

Locate valuable documents such as the White Star Institute Documents and the Worn Tablet for additional lore.

Find password letters—the ninth (R) and seventh (O)—hidden within the area.

Utilize the Sampling Cart and interact with the Strange Causality Modulator to gain buffs.

Increase your ATK through specific in-area mechanics.

Use the Piggy Bank to gain gear coins, enhancing your purchasing power in the shop.

Obtain the Laboratory Map, which provides insights into upcoming zones.

Outpost Beacon

Acquire various items like the Deformed Metal Wreckage and the Broken Drone, which may play a role in event progression.

Discover the Bangboo’s Data Memory Card, which contains crucial information.

Encounter Bigger YV, a notable enemy or NPC interaction within the zone.

Find additional password letters—the second (H), third (E), and fifth (S)—needed to solve the final puzzle.

Explore the Ruins, which may contain hidden rewards or additional lore.

Laboratory Ruins

Navigation is challenging, as tiles remain invisible until stepped on.

Solve the password puzzle, which spells CHESSBOARD when all clues are collected.

Acquire the Damaged Safe, a key item in this area.

Unlock a hidden mechanic by carving the word “CHESSBOARD” using crate destruction, which may grant additional rewards.

Turbulent Corridor

Encounter the Strange Melee Weapon, a potential upgrade or interactive item.

Obtain the Intact Data Memory Card, which holds valuable information.

Locate password letters—the eighth (A) and tenth (D)—to complete the final puzzle.

Discover the Photo of a Young Girl, another key lore-related item.

By thoroughly exploring each area and collecting key items, you can unlock hidden mechanics, solve puzzles, and optimize your progress through the Arpeggio Fault. Keeping track of the CHESSBOARD password letters and interacting with critical objects will ensure maximum efficiency and rewards during your expedition.

Unlocking the Password

Throughout your exploration of the Arpeggio Fault, you will encounter Strange Bangboos that provide you with letters needed to solve a critical puzzle. When arranged correctly, these letters form the password CHESSBOARD, which is required in the Laboratory Ruins to unlock hidden mechanics and potential rewards.

Letter Locations Recap

C – Found in Fault Surface Shallows Area.

H – Located in Outpost Beacon Prep Area.

E – Discovered in Outpost Beacon Fault Floor.

S – Hidden in Outpost Beacon Mid-Level.

B – Found in Fault Surface Fault Area.

O – Located in Old Observatory Fault Floor.

A – Discovered in Turbulent Corridor Ether-Stable.

R – Hidden in Old Observatory Prep Area.

D – Found in Turbulent Corridor Fault Floor.

Once you have collected all the letters, inputting CHESSBOARD in the designated location within the Laboratory Ruins will grant access to new interactions, potential buffs, and valuable in-game resources. This puzzle is an essential part of maximizing your progress and uncovering hidden secrets in the Arpeggio Fault.

Claiming Your Rewards

Successfully navigating the Mystery of Arpeggio Fault provides a wide array of rewards, including both limited-time event rewards and permanent progression materials. These rewards can enhance your agents, improve your Bangboo, and provide valuable in-game currency.

Major Rewards: Knightboo and Knightboo Cores

One of the most significant rewards is Knightboo, an A-Rank Bangboo specialized in support and Ether DMG. Knightboo can regenerate Energy and unleash a powerful Chain Attack, making it a valuable addition to your team.

Unlocking Knightboo: Earned upon completing Fault Area 1.

Knightboo Cores: Acquired by completing Fault Areas 2–5, allowing you to further enhance its abilities.

Limited-Time Rewards

Throughout the event, you can earn exclusive, time-limited resources that help boost your progress:

Polychromes – The premium currency used for summons.

Specialized Shock Chips – Used to enhance W-Engines.

Senior Investigation Logs – Essential for leveling up agents.

Dennies – The primary in-game currency for upgrades and purchases.

Permanent Rewards

In addition to the event-limited rewards, players can obtain permanent resources that benefit their overall account progression:

Polychromes – Available through various challenges and milestones.

Inter-Knot Experience – Increases your Inter-Knot level for additional bonuses.

Senior Investigation Logs – Ensures continuous agent progression.

W-Engine Energy Modules – Critical for upgrading W-Engines and improving combat effectiveness.

By fully exploring each Fault Area and completing key objectives, you can maximize your rewards and strengthen your roster, making the Arpeggio Fault a valuable long-term investment for your account.

F.A.Q

Can I replay stages in the Zenless Zone Zero Mystery of Arpeggio Fault event to find missed items?

Yes, players can revisit stages to locate missed items, such as Lost Items or Strange Bangboos. Replaying stages allows for thorough exploration and the opportunity to collect all event-related rewards

Are there any limited-time rewards in the Zenless Zone Zero Mystery of Arpeggio Fault Guide?

While the event itself is permanent, certain rewards, like 400 Polychromes and 20 Specialized Shock Chips, were available only during the initial event period. Players who missed these can still engage with the event for permanent rewards

What are the differences between Normal and Challenging modes in the Zenless Zone Zero Mystery of Arpeggio Fault Guide?

In Challenging Mode, players face stronger enemies, reduced Tech Tree effect trigger rates, and cannot recruit agents during runs. However, Crimson Silk acquisition is increased by 50%, offering greater rewards for the added difficulty.

What is the significance of the password in the Zenless Zone Zero Mystery of Arpeggio Fault Guide?

Players will find Strange Bangboos during the event that give password letters. Collecting the full password is key to unlocking hidden content in the Laboratory Ruins stage.

Who is Knightboo in the Zenless Zone Zero Mystery of Arpeggio Fault event?

Knightboo is an exclusive A-Rank Bangboo obtainable by completing the first area of the event. It serves as a support-oriented companion, offering energy regeneration and Ether damage through its Chain Attack.