Treacherous Light of the Depths

Treacherous Light of the Depths is a World Quest in the Fontaine Research Institute of Kinetic Energy Engineering Region, Fontaine.

Start Location

Start the quest by entering the underwater ruins at Bossuet's abandoned laboratory, located in the southeast corner of the Fontaine Research Institute of Kinetic Energy Engineering Region.

Steps

Explore inside the ruins
Start the optical device
- Calibrate the device when the image is at its clearest.
Investigate the other optical devices in the ruins
Start the optical device at the center of the ruins
Defeat the clockwork meka
- Suppression Specialist Mek - Ousia ×1
- Recon Log Mek - Ousia ×1
Continue exploring
- Suppression Specialist Mek - Ousia ×1
Investigate the mysterious room
Defeat the clockwork meka
- Prototype Artificed Dancer "Lothair" ×1
- Prototype Artificed Dancer "Claire" ×1
Talk to the researcher
Recover the Punched Tapes
Talk to Sevigne
Dive into water to exit the room
Exit via the current
Go to the new Fontaine Research Institute
Find Chisseray and pass on the news

Gameplay Notes

Completing the quest grants the Wonders of the World achievement What Lies at the End of the Rainbow...?
A Mysterious Ore can be found at the end of the current.

Tutorial

Experimental Focusing Mirror: A convergence prism with experimental crystal light path components installed. If you initiate manual calibration at the point where the image is clearest, you can successfully complete the light convergence.

Dialogue

Quest Description

You encounter a mysterious light-emitting device within some peculiar underwater ruins...

(Enter the ruins): Paimon: Whoa... Who knew there was such a huge space under the water, with strange devices too!; Paimon: Paimon doesn't have a clue what that device is for, but it looks like its been abandoned for a long time, and nobody's been here either...; Paimon: Let's be careful!

(Approach the first Experimental Focusing Mirror): Paimon: Are you sure you want to touch it? What if it breaks...

(Calibrate the first Experimental Focusing Mirror): Paimon: Oh! Paimon doesn't know what's going on, but it didn't break! At least, that's what Paimon's intuition says!

(Approach the second Experimental Focusing Mirror): Paimon: If you look closely, it seems like something is missing...

(Calibrate the second Experimental Focusing Mirror): Paimon: Maybe we'll find something if we follow the light!; Paimon: Isn't there a saying like, y'know, "the treasure at the end of the rainbow"... and stuff?

(Approach the third Experimental Focusing Mirror): Paimon: Huh? There's parts missing here too?

(Start the central device): Paimon: What's that sound...? We didn't break anything, did we?

(Approach the clockwork meka): Paimon: No reaction... It seems different from most clockwork meka, but Paimon doesn't know how exactly...

(Interact with either of the clockwork meka, optional): Strange Clockwork Meka: (The clockwork meka does not move, as if awaiting a command.)

(Read the book near the bookshelf, right of the Strange Clockwork Meka; optional)

Bossuet Research Institute Project Result Summary (I)

Introduction

Since Monsieur Bossuet became the supervisor of the Bossuet Research Institute (formerly known as Alain Guillotin Memorial Research Institute), his flawless decisions and wise leadership have led to remarkable results in multiple research areas.

Out of respect and in gratitude to Monsieur Bossuet (Note: I am absolutely not being mandated to do this by Monsieur Bossuet himself), his highly original research results shall be collected here for future reference.

Junior Researcher Chisseray

...

Title: Theoretical Analysis and Design of the Novel Artificed Core Configuration

Authors: Bossuet and Chisseray

Introduction: This paper introduces a new theoretical artificed core configuration, elaborates on the operating principle and design requirements of the configuration, and compares it to the traditional configuration (Guillotin Configuration). Calculations show that in an ideal situation, the configuration's optimal output is slightly higher than the traditional one.

Remarks:

This paper was selected as Fontaine Research Institute of Kinetic Energy Engineering's Outstanding Paper of the Year, and as a result, Monsieur Bossuet has been awarded the title of Senior Technician.

Junior Researcher Chisseray

...

Title: Research on Synchronous Control and Applications Based on the Novel Artificed Core Configuration

Authors: Bossuet, Maillardet, and Chisseray

Introduction: This paper explores the feasibility of applying the new artificed core configuration to synchronous control and proposes a new mode of artistic expression.

Remarks:

Ugh, if only Maillardet wasn't so obsessed with these weird dancing toys...

Junior Researcher Sevigne

Please do not write strange things in the remarks column.

Junior Researcher Chisseray

...

(Interact with the portrait to the left of the Strange Clockwork Meka, optional): Portrait: (A portrait.); Portrait: (Next to the portrait is a memo reading: A renowned painter of the Court of Fontaine was commissioned to paint this portrait of Monsieur Bossuet to commemorate the fantastic showing of "Icewind Suite.")

(Read the book on the ground behind the portrait, optional)

Bossuet Research Institute Project Result Summary (II)

Title: An Innovative Circuit Design Using Clockwork Meka to Simulate the Rock-Paper-Scissors Game and Its Sociological Impact

Authors: Bossuet, Sevigne, and Chisseray

Introduction: This paper explores the feasibility of applying the new artificed core configuration to sociological game simulations and proposes a new circuit design scheme for specific gaming fields.

...

Title: (Crossed out)

Authors: Bossuet, Genevieve, and Chisseray

Introduction: (Crossed out)

Remarks:

Chisseray, don't forget to tear this page off. Do not allow this academic blemish to remain here.

Senior Technician Bossuet

...

(Activate the device)

(Prototype Artificed Dancers Claire and Lothair activate)

Paimon: Uh oh, looks like we messed up messing with the system this time!

(After defeating the meka)

(A woman walks out of the closed room)

???: I almost thought Mr. Eastinghouse had come back, what with all the shaking and fighting noises... Turns out it was actually someone accidentally triggering the devices outside...

???: Oh no, Maillardet's prototypes... How did they end up like this?

(Interact with the terminal inside the formerly closed room, optional): Paimon: Let's avoid fiddling with the instruments here again...

(Talk to ???)

Paimon: Uh, did we... Did we just do something really bad?

???: That's quite odd, I felt a vibration earlier...

I felt it too.

Could it just be in your head?

Paimon: Hmm, it could be because we messed with the device on the upper level...

???: The door here was locked before, right? And there were even some clockwork meka specially guarding it...

I gave the guards a "break" and then opened the door.

Yeah! So weird, why's the door open now?

Paimon: We... We didn't have a choice! They attacked us first, so it was legitimate self-defense!

???: Maillardet's prototypes... They should have been in standby mode. After all, even [sic] since he scored such a nice spot on Erinnyes, he hardly ever came back.

???: Now that I think about it, who would want to come back to this damp, dilapidated lab when you could show off your research to an adoring audience in a stunning place like the garden dance floor?

???: After Mr. Bossuet left his post, everyone was scattered throughout the institute, just like the materials here. Not even a couch was left behind.

???: There should only be prototypes here, waiting for those who will never return. Normally they'd just be standing here on standby, and that's no big deal. But now, oh, it's just great.

???: Take a look! They've been beaten so badly that most of the clockwork machinery has fallen out. If Maillardet found out...

That was me. Sorry.

Ever considered upgrading the strength of the prototypes?

???: Maillardet did do that. Maybe the final product will meet your expectations.

Paimon: Sorry... Is this prototype expensive? If we have to provide compensation...

???: Relax. I was going to say if Maillardet found out, he would definitely laugh out loud.

???: After all, usually it was him interrupting the dancing of the prototypes, and after he was beaten to the ground, he'd sit there laughing.

Sevigne: Oh, I've been talking so much yet I haven't introduced myself. I'm a researcher at the Fontaine Research Institute. You can call me Sevigne. And you two are...?

Paimon: Paimon's Paimon, and (‍‍/‍‍) is (‍‍). We're, uh...

Just passing by, with no other intentions whatsoever.

Paimon: Yes! We're just passing by, and definitely didn't think there were any treasures in here so...

Are there any treasures in here?

Sevigne: Oh, you mean like a ruins tour with treasure-hunting sessions? You're in the wrong place for that. This might seem like a ruin but... Well, actually, it is a ruin.

Sevigne: Though it's not on any lists of recommended ruins for tourists yet.

Paimon: Fine... Then we'll be leaving now...

Sevigne: ...Wait, you've heard of the new Fontaine Research Institute, right? If you're leaving, can you do me a favor and go there and find Chisseray...

But we're not going there.

We've still got other treasure to find.

Sevigne: Then what am I going to do now? I've still got work to do, and Maillardet's prototypes were broken! I need someone to haul them back as soon as possible...

Paimon: Hmm... Maybe we should help her out, (‍‍)...

Sevigne: Wonderful! Since you're willing to help me, I'll leave the recovery of the punched tapes to you, too.

Had I known, I never would have touched those devices outside...

Sevigne: Don't say that. After all, it's just a piece of cake for you!

No problem. I got this.

Sevigne: This way I can have the commission cost reimbursed as a research materials recovery expense.

Paimon: Really? You sure that's okay?

Sevigne: As it is indeed helping our research work, it is completely justified and legitimate. Of course it's okay!

Sevigne: If it's questionable, the request will be rejected by the administrative staff anyway. In which case I'll just cover the commission cost out of my own pocket.

Do you often do things like this?

Sevigne: Not personally! I don't know about anyone else, but I've heard stories before... Never mind, it's not something outsiders would be interested in.

Sevigne: There are three punched tapes to recover. Or there should be only three of them on the shelf. They should be pretty easy to find. Thanks for doing this, you two.

Sevigne: Meanwhile, I have to check the prototypes again, since it's been a long time since they were last serviced... It won't be fun if they go haywire.

Paimon: All right, then we'll come back after we get the tapes.

(Talk to Sevigne again, optional): Sevigne: The punched tapes should be on the bookshelves inside, so look for them there. As for the other research materials...; Sevigne: It should be okay to look, right? Not like they're classified or anything...

(Read Bossuet Research Institute Project Result Summary (I) or (II), optional): Paimon: This isn't it, right?

(Read the other Bossuet Research Institute Project Result Summary, optional): Paimon: This... doesn't seem right either.

(After obtaining all three Punch Tapes): Paimon: Sevigne said there were only three tapes, so this should be all. Let's go check with her.

(Talk to Sevigne after recovering the Punched Tapes): Paimon: These are the tapes we're supposed to recover, right?; You show the recovered punched tapes to Sevigne...; Sevigne: Yes, these are the ones! You guys are so efficient, not sloppy in the least!; Paimon: Something as easy as this? No way we're not finishing that in a jiffy!; Sevigne: That's still commendable. I'm not exaggerating when I say some of my colleagues could squander a whole day just to find one simple thing...; Sevigne: Though let's not speak of that now. Please bring the punched tapes back to Chisseray.; Sevigne: And tell her I won't be going back just yet. Oh, and let her know to get in touch with Maillardet and let him know he should recover the prototypes here ASAP.; Paimon: Okay. So, (‍Traveler‍), shall we go back the way we came?; Sevigne: Oh, that won't be necessary.; Sevigne: You two can dive, right? There is actually a waterway you can use. It was sealed to prevent accidental falls. I can open it back up.; Paimon: That will be great! Let's take the waterway, (‍Traveler‍)!; Sevigne: The terminal to open it is inside. I can do that alone. You'll be fine getting out of here on your own, won't you? You won't get lost?; Paimon: Of course, don't underestimate us! Paimon is the best guide in Teyvat. There's no way (‍Traveler‍) is getting lost with Paimon around!; Sevigne: Good. Thanks for delivering the message and the punched tapes for me. Hope you don't mind if I don't show you out.

(Talk to Sevigne again inside the room she was in, optional): Sevigne: The waterway isn't designed to be an actual route, but it should be safe. At least I never ran across anything dangerous the last few times I tried it.

(After riding the current): Paimon: It may be really safe... but it's not a shortcut at all!; Paimon: The punched tapes are soaking wet... Let's go to the New Fontaine Research Institute and find Chisseray.

(Talk to Chisseray): Paimon: Hello! About Ms. Sevigne...; You describe what happened to Chisseray and give her the three punched tapes...; Chisseray: I was just mulling over whether to go check up on her. So that's what happened. Thank you for the update... and for the punched tapes, too.; Chisseray: It's surprising that Maillardet's prototypes can still move, and that Sevigne is still working in such a dangerous environment. I'll talk to the administrative staff about arranging the recovery.; Chisseray: And see about the possibility of expensing it while I'm there... That was quite clever of her. It's up to the administrative staff whether or not to reimburse it in the end, but I'll pay it for the time being.; Chisseray: Anyway, thanks for your help. Here's your pay for a job well done.

Trivia

After riding the current but before talking to Chisseray, Sevigne's position changes from having her back to the mechanism, to facing the mechanism. There is no change to her dialogue, and after talking to Chisseray, Sevigne can no longer be found there, and will instead be located at the New Fontaine Research Institute.

Video Guides

Guide: Treacherous Light of the Depths

Treacherous Light of the Depths Guide

Other Languages

Language	Official Name	Literal Meaning
English	Treacherous Light of the Depths	—
Chinese (Simplified)	海渊封缠的乖离光
Chinese (Traditional)	海淵封纏的乖離光
Japanese	海淵で引き離された光 Kaien de Hikihanasareta Hikari
Korean	해연에 갇힌 괴리된 빛 Haeyeone Gachin Goeridoen Bit
Spanish	Haces traicioneros en las profundidades	Traitorous Lights in the Depths
French	Lumières perfides des profondeurs	Treacherous Lights of the Depths
Russian	Коварный свет из глубин Kovarnyy svet iz glubin	Treacherous Light from the Depths
Thai	แสงผิดแผกแห่งห้วงลึก
Vietnamese	Ánh Sáng Nguy Hiểm Dưới Đáy Biển
German	Durchsickerndes Licht aus den Tiefen	Seeping Light From the Depths
Indonesian	Cahaya Pengkhianatan Dasar Laut	Treacherous Light of the Depths of Sea
Portuguese	Luz Traiçoeira das Profundezas
Turkish	Derinliklerin Tehlikeli Işığı
Italian	Luce infida nelle profondità

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Released in Version 4.1

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