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The Mystery of Arpeggio Fault (B)

Last updated 2026-09-10

The Mystery of Arpeggio Fault (B) is a set from the Lost Items From the Old Capital's section of Ray's Research Log. It is obtained while carrying out the questline for The Mystery of Arpeggio Fault.

Set Description

A clue obtained while investigating the Arpeggio Fault. Perhaps it can help us unveil the truth about what happened to the vanguards two years ago.

Clues

IconNameObtainable In
Item Deformed Metal WreckageDeformed Metal WreckageUnknown
A sizable piece of mechanical debris with a distinctive camouflage paint job, resembling components from a rebel Armed Mech. The debris shows signs of deformation from a strong impact.
Item Universal Audio Memory CardBangboo's Data Memory CardUnknown
A data storage card found in the broken Bangboo containing a few remaining audio files.
"...Calling... Calling 4412! Report back immediately, report back immediately! If you don't, you will be considered a traitor!"
"Captain, 4412's tracking signal has gone towards the Institute's group! And..."
"That useless... that girl has always messed things up! She failed before, and now she dares to..."
Item Broken DroneBroken DroneUnknown
A damaged drone that appears to be reconnaissance equipment from the insurgents based on its markings. The drone still contains some audio data.
"...The Ethereal is abnormally large! Should we have the autonomous combat units avoid it?"
"Evade immediately. Take the alternate route to the lab to ensure the demolition goes smoothly. We must get what we need this time."
"Understood, executing immediately."
"Retract the drone, and do not approach the creature too closely to avoid drawing its attention..."
The audio abruptly cuts off.
Item Universal Audio Memory CardIntact Data Memory CardUnknown
A data storage card found in the area where rebel armed Mechs were eliminated. It was stored in multiple layers of anti-corruption serum, preventing it from becoming corrupt over time. It seems the owner tried hard to preserve it, but unfortunately, it was lost in the Hollow.
It may contain critical information.
Item Damaged SafeDamaged SafeUnknown
A locked box was found in the Ruined Buildings of the suspected underground storage of the Fourth Laboratory. The box has been opened, and only a few scattered documents and photos remain, making it impossible to determine the original contents. Inside the box, there's a note that reads, "May the Creator... lead... to fulfill the lifelong wish..." The paper's material is noticeably different from the other documents. Due to Corruption, some of the writing is difficult to decipher.
Item Photo of a Young GirlPhoto of a Young Girl (Lost Item)Unknown
A Polaroid photo found beneath the tombstone of Alowyn Mystik. The photo was stored in multiple layers of anti-corruption serum, preventing it from becoming corrupted over time. The woman in the photo is wearing a White Star Institute uniform, looking a little nervous as she faces the camera. Her appearance is unremarkable — likely the kind of face many people would quickly forget...
But a certain Bangboo never will.

Other Languages

LanguageOfficial Name
EnglishThe Mystery of Arpeggio Fault (B)
Chinese
(Simplified)
断层之谜・下
Duàncéng zhī Mí - Xià
Chinese
(Traditional)
斷層之謎・下
Duàncéng zhī Mí - Xià
Japanese断層の謎・下
Korean단층단층 수수께끼・
Dancheung-ui Susukkekki - Sang
SpanishEnigma de la falla Arpegio (II)
FrenchLe mystère de la Faille de l'Arpège (B)
RussianТайна Арпеджио (B)
Tayna Arpedzhio (B)
Thaiปริศนาของ Arpeggio Fault (II)
VietnameseBí ẨnBí Ẩn Tầng Gãy II
GermanRätsel um die Arpeggio-Verwerfung (B)
IndonesianMisteri Fraktur Arpegio (II)
PortugueseMistério da Falha do Arpejo (B)

Change History