Threshold Simulation/Hard Mode/Branching Echoes
Last updated 2026-08-30
Branching Echoes is a version of Threshold Simulation: Hard Mode that was released in Version 2.3, and lasted until Version 2.6.
Branch Flowchart
Intro
The Fairy's Hint
"Master, welcome to the Hollow."
Fairy's voice rings in your ears as usual.
"For the sake of your mental and physical well-being, please remain calm, regardless of what you encounter, as I have already screened out potentially disturbing scenes."
"And don't celebrate, either, since what's been screened could just as well be thrilling scenes."
"Please note: This simulation will use Agents' real appearances, but the story that follows is generated from your choices, combined with Fairy's detailed understanding of human society. If it's a little off, it'll be better next time."
Battle 01
- 1-1
- 1-2
- 1-3 Optional
- BATTLE 01 Final
| 1-1 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] BATTLE 01 stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| 1-2 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] BATTLE 01 stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| 1-3 Optional | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] BATTLE 01 stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| BATTLE 01 Final | |
|---|---|
Details:
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| — | |
| Wave 3 | Wave 4 |
| — | — |
Story 01
If We Answer the Call for Help
The performance in the Hollow is over! The Agents watched the Marionettes' final bow regretfully, trying to piece together the untold story behind the ballet sisters of urban legend.
But you quickly stopped them — there will always be regrets in the Hollow, and the living can only embrace their sorrow and move forward.
After some thought, you spoke up to comfort everyone.
"If you miss them, just head to the Notorious Hunt. It happens every week."
...Though everyone looked a little puzzled, your words did the trick, and you all kept moving forward.
"H—Help... help us!" A cry for help echoes from the Hollow, a sound you're all too familiar with. You know well that behind the Mist lies either a tragic victim or an unknown danger.
"Please briefly describe the crisis you're facing?" you shout into the depths of the Hollow.
"It's dangerous ahead. That Ethereal..." the reply comes quickly, accompanied by a weak cough, "it keeps repeating."
"Oh? And what exactly does it repeat?"
"...May the Creator refine me!"
"...there are many Ethereals who might repeat those words.
You've come to believe the injured person's account, but you still have an important mission and can't afford any more delays.
Will you rescue the injured person right in front of you...
Or stick to the plan, press forward, and search for the core of this Companion Hollow?
—Your choice here will cause the future of STORY 2 to branch...
| Rescue the Wounded First | Eliminate the Hollow first |
|---|---|
| A hail of bullets came straight at you. The ones you rescued weren't victims, but a group of vicious Hollow Raiders who had just lost a fierce battle against the Exaltists in the Hollow. They fled and see you as nothing more than a walking supply cache. Too bad they were wrong! You and your Agents are the most terrifying — no, the most righteous force in the Hollow. They got what they deserved and had to hand over all their Supplies to you. "'What to Eat in the Hollow: The Ethereal Cookbook'... what is this? Better toss it. And... an autographed photo of the Angels of Delusion, I'll hold onto that for now. Let's see what else... ah, now this is useful!" —You obtained a Finishing Shot Pistol. Take it with you to handle the next crisis. |
You chose to stick to the original plan. As an experienced Proxy, you know better than to trust anyone in the Hollow. ...Sure enough, it's that caution that ensures you always come out on top in the Hollow! After discovering your refusal to walk into their trap, the Exaltist followers who were pretending to be injured began gathering in the Mist, surrounding you. To your shock, you spot a number of familiar figures lying in the distance... Public Security Officers you've crossed paths with before. They got caught in the Exaltist plot, and turned into test subjects to measure the Sacrifices' strength... and you can never forgive such an act. —You've gained "Feelings of Rage", only vengeance can quell this burning fury. |
Battle 02
- 2-1
- 2-2
- 2-3 Optional
- BATTLE 02 Final
| 2-1 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] BATTLE 02 stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| 2-2 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] BATTLE 02 stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| 2-3 Optional | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] BATTLE 02 stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| BATTLE 02 Final | |
|---|---|
Details:
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| — | |
| Wave 3 | Wave 4 |
| — | — |
Story 02
The Abyss Stares Back
You defeated that eerie arm-shaped Sacrifice and tried to get more intel from its deranged mind... but just as you opened your mouth, the pistol you obtained earlier began strangely. Its dark barrel automatically aimed at the Sacrifice's head, the trigger pulled, and everything in front of you exploded.
You ran your hand over the pistol and gleaned more information before it vanished.
"This is a pistol that automatically delivers a killing blow. It always jams when you need it most, and its only purpose is to finish off villains after they're down, silencing them before they reveal any spoilers."
You took another careful look and found there was another page.
"Special note from the Supreme Assistant: The data collected is insufficient to complete the deduction. For a seamless experience, random plot logic will be auto-generated. If you're unhappy with the result, change it up next time."
You accepted this explanation.
All in all, you dealt with a major incident in the Hollow and can now move forward.
You continued forward and encountered a Prophet in the Hollow, who claims to be a traitor to the Exaltists.
He can foretell a message about your future, provided you offer him satisfactory payment.
"I crave chargrilled supercritical Ether hearts, or slow-aged Thracian... Fine, I'll settle for chilled Netherblossom salad... You don't have that either? Let's compromise then — how about something sweet? A Doppelganger mille-feuille, perhaps?"
You've never heard of these dishes, but you managed to come up with a solution.
—Your choice here will cause the future of STORY 3 to branch...
| Tell him you've defeated an Ethereal with massive arms | Threaten him with force |
|---|---|
| "I recognize him, that's Sacrifice Bringer! He carried out the Creator's orders brilliantly! Now that you've defeated him, I can savor the taste of his lingering regret... truly delicious!" The Prophet hurried off to feast, but before leaving, had just enough time to tell you some bad news. "The overseer is watching you. Hide your precious memories well, lest they one day turn their blade against you." You believed this prophecy and continue deeper into the Hollow... and to your surprise, the prophecy came true. |
As the most righteous force in the Hollow, you and your Agents never bow to evil threats. Thus you resorted to certain tactics, of the kind that AI would automatically block, forcing the unknown prophet to speak, seething with rage yet powerless to resist. "The Overseer's gaze is cast upon the city, and will not stop until your important companion is taken away." You question this prophecy and continue deeper into the Hollow without looking back... but to your surprise, the prophecy comes true. |
Shadow of the Past
You and your Agents furiously defeated the arm-type Sacrifice that was once human, then furiously tried to find more intelligence from its broken body. You furiously reached out, but ultimately lost control and threw multiple Ether Power Canisters at it.
The massive explosion cleared away all evidence, along with your rage.
As you calm down, you begin to think.
"Fairy, you over-simulated all of our emotions, inflating the Agents' stats beyond their limit, until they completely lost control."
"Master, as you sometimes ask to 'skip' the story, I created certain logic on my own so you could move faster to the next plot node. If it doesn't suit you, feel free to change it next time."
You accept this explanation and move forward.
With every step forward, the Hollow's unusual nature grows more apparent.
Murky Miasma, hallucinations, high concentrations of Ether, fallen victims scattered along the way, and even traces of military combat operations left behind.
"What on earth happened here? Is it really just highly active Ethereals deep in the Hollows?"
Your thoughts are cut short by the sound of gunfire. Looking up, you can faintly make out a squad of soldiers in old military uniforms, emerging like phantoms from the far end of the path.
Is this a hallucination... or reality?
—Your choice here will cause the future of STORY 4 to branch...
| This is an illusion caused by the Miasma | Launch a direct attack on them |
|---|---|
| You judge the shadowy figures in the Mist to be mere illusions brought on by the Miasma. In the Hollows, even sights and sounds can be deceiving. And behind those deceptions, a far more terrifying presence surely lurks. "Proxy, look. The sky... it's covered in crimson fog." That presence is drawing closer to you. |
An intense sense of foreboding stirs within you! You firmly believe the tainted phantoms of the past truly exist, and that something far greater is concealed behind them. You and your Agents launch a direct attack against them... The result is clear — they were indeed beings formed from Miasma. If they can be discovered, they can be destroyed. But such commotion will undoubtedly draw attention from the powers behind the scenes — the Exaltist followers have found this place. You have no choice but to deal with them as well — your practiced skill making you look every bit the veteran Hollow Raider. And when you rifle through their belongings... you appear all the more like one. —You obtained "Clothes commonly worn by Exaltist Worshippers". Disguised, you slip past any Exaltists along the way and reach the altar's depths where the overseer waits... Seizing the moment, you launch your attack! |
Battle 03
- 3-1
- 3-2
- 3-3
- 3-4 Optional
- BATTLE 03 Final
| 3-1 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] BATTLE 03 stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| 3-2 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] BATTLE 03 stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| 3-3 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] BATTLE 03 stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| — | |
| Wave 3 | Wave 4 |
| — | — |
| 3-4 Optional | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] BATTLE 03 stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| BATTLE 03 Final | |
|---|---|
Details:
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| — | |
| Wave 3 | Wave 4 |
| — | — |
Story 03
Support Request
The Exaltists blocking your path are defeated, but the Ether concentration in the Hollow remains just thick. You recall the prophecy you trusted so deeply, convinced that something far more terrifying, some Miasma-forged creation, awaits ahead. It feeds on ill-fated memories, powered by Miasma, to give a twisted rebirth to tragic souls already lost... regardless of their own will.
You let out a heavy sigh... having to stand against someone you once knew is something you can never steel yourself for.
"If you can't bring yourself to deal with someone you know, let's switch opponents."
You hear some strange murmuring.
"We help each other out — taking down each other's targets, serving as one another's alibis, never giving anyone reason to doubt us... Truth is, some folks have long overstayed their welcome."
...Can't be. This must be a hallucination from the Miasma. There isn't a conspiracy unfolding here.
At the very least, you come away from this talk of "helping each other" with some inspiration for solving ypur problems. If the Hollow's expansion grows more severe, and it becomes too much for your group alone to handle, maybe you can...
—This choice will determine your opponent in the "LAST NODE".
| Request help from the Supreme Assistant | Contact assistance outside the Hollow |
|---|---|
"Master, I'm glad you thought of me at the last moment." ou [sic] finally remembered! The reason you felt so insecure on this whole journey was because you'd lost the gentle, reliable guidance of the Supreme Assistant. But it's alright, it's never too late to meet the right AI. "As per your request, I'll assign opponents your Agents don't recognize for the upcoming final challenge, ensuring they won't hesitate when it's time to strike." "If there are any mistakes, consider them purely accidental." As the exploration draws to a close, you finally see it — the Wandering Hunter appearing in the distance... |
With your mind set, you waste no time and put your expertise to work, contacting others. As "Phaethon," you cannot yet step into the sunlight, so you carefully choose partners you know near the video store. You have zero doubts about their capabilities - everyone who survives here, from students to employees, from Thiren to Bangboo, is a force to be reckoned with. Soon, those who received your invitation start arriving one by one, guided by Eous... With everyone pitching in, the Hollow was cleared faster. In the end, only one target remained — it's your time to shine as the final hero. As your exploration draws to a close, you finally spot it in the distance - the Wandering Hunter... |
Bad Omen
Sure enough, you run into the mysterious figures of the Exaltists... and with each moment, you feel more certain they are something beyond human. In body and in creed alike, there is no good, no evil, only terrifying fanaticism. What is it they are so devoted to?
"...Taking away your precious companions."
You keep recalling that sinister prophecy. The moment you met the Exaltist overseer, half of it had already come true, and the remaining half...
Thinking about this, you decide to check on everyone's safety right away, but time is short, and you only have the chance to make one phone call—
—This choice will determine your opponent in the "LAST NODE".
| Contact Hollow Special Operations | Contact Suibian Temple |
|---|---|
Unfortunately, everyone from Section 6 has vanished." You received the worst possible news. From the moment the Exaltist overseer appeared, their scheme had already come to fruition, making the overseer's death ultimately meaningless. Countless rapidly expanding Hollows had already descended upon the city's Core district without your notice, and the last hope — the Void Hunter — remains lost within this strange Companion Hollow, with no response. You were too slow, slow enough for every worst-case scenario to unfold; you overlooked many details, like forgetting that HSO would never sit idle in the face of disaster — they're always at the frontline. You can no longer change the outcome; you can only try to salvage what little hope remains... Your exploration reaches its end as you finally see the Wandering Hunter appearing in the distance... |
"Fortunately, your communication saved us. Otherwise... you might have seen the news of the Void Hunter's downfall on TV the next day." You analyzed the Hollow's coordinate data and irregularities in detail, and decided it would be best to reach out to Suibian Temple at this point. This timely warning came at a crucial moment — without your knowledge, countless rapidly expanding Hollows had already descended upon the city's core district. The situation was so dire that HSO couldn't respond in time. At that moment, the personnel stationed at Yunkui Summit received your warning and provided crucial assistance to the Section 6 members caught within these Hollows, helping them withstand the Exaltist assault and reducing those impure creatures to ash. "That's why we still have the strength to come support you now." Together, you face the final challenge. As your exploration draws to a close, you finally see it — the Miasmic Fiend appearing in the distance... |
The Will That Should Exist
The overseer has fallen, but the dispersing Miasma feels as if it's being guided, surging toward the unknown depths.
You speculate that from the moment they gave up their identity as humans, the "death" of the individual might have ceased to matter.
What truly defines their existence is a secret, a power, a long-term plan unknown to all.
And you've merely scratched the surface.
"We have to stop the Miasma from gathering further. At this rate, the Hollow's expansion will surpass the Zenless Limit."
There may not be enough time to investigate why the Miasma is growing.
"But there's still something we can do—"
The excess anomalous Ether that once scattered across the Companion Hollow, unable to dissipate, now gathers in one place. There's bound to be a Core there.
"Destroy it, or be devoured by the Hollow... the decisive moment is here."
But the Hollow's "will" seems to have sensed this, and the demons formed from Miasma once again stand in your way...
"Proxy, leave this to us."
You're pulled into a strong embrace from your most trusted Agent.
"Keep going forward and find that Core... We'll stay alive, come find you, and then we'll escape the Hollow together."
—This choice will determine your opponent in the "LAST NODE".
| Stay and fight together | Advance alone in search of the Hollow's "core" |
|---|---|
You recalled so many memories... Being surrounded by rampaging Ethereals alongside your Agents. Falling into deadly traps laid by the Exaltists with your Agents. Accepting strange commissions through the Inter-Knot, only to end up unpaid — and sometimes the debtor was an Agent themselves. Going to the movies with the Agents, where everyone insisted on watching something different, leaving you stuck there from morning till night. And… countless small yet precious moments, each weaving into an unbreakable bond between you, the very thing that kept you rooted in place. "...Don't say goodbye so easily. I am your Proxy, and I will never abandon my Agents." The exploration comes to an end, and at last, you see it — the Wandering Hunter appearing in the distance... |
Every second counted as you raced through the Hollow. As the Proxy, it was your duty to guide everyone forward—until, deep within the Hollow, you saw it. An Ethereal, one that had unexpectedly absorbed all the scattered Miasma, gaining a power far beyond the ordinary. ...but so what? "We meet again, Proxy." Your Agent honored their word, scarred and smoke-stained, but having cut down every barrier to stand by you once more. "Hope I don't look too worse for wear." Only now do you truly find the courage for this do-or-die moment. The exploration reaches its end, and at last you see it — the Miasmic Fiend appearing in the distance... |
Tribute
You brought down the overseer, but the thrill of victory is immediately drowned out by the overwhelming sight ahead — an overflow of Miasma streams endlessly into the Hollow's uncharted depths.
"We have to stop the Miasma from gathering further. At this rate, the Hollow's expansion will surpass the Zenless Limit."
Looks like the Exaltists' influence reaches far beyond just here... You don your disguise once again and investigate in the direction of the disturbance.
You have witnessed a truly horrifying sight.
Countless streams of Miasma flow in reverse, swirling and mutating, gathering until it giving birth to a fabricated form — the fallen overseer gradually resurrects in a bloody, grotesque shape... revealing her true form!
Even with her honor in tatters, she stubbornly clings to her old path... until, in the end, she finds herself moving against every companion.
She has also noticed your presence, though she has yet to uncover who you really are.
As disguised followers, you must, like other fanatics, willingly offer something to temporarily gain her trust and find an opportunity to get close to her...
—This choice will determine your opponent in the "LAST NODE".
| Offer up your flesh and blood | Surrender your memories |
|---|---|
You recall the purpose of the Sacrifice Serum... Nothing could earn their trust better than taking that serum and willingly becoming a Sacrifice. You follow the other believers, chanting the Exaltist vows together, lining up to receive the final "blessing." Closer and closer... until finally, you find the one chance to strike at her! But you were too reckless... administering the Sacrifice Serum didn't require any close contact, and your unusual behavior caught her attention. "What a clumsy attempt... I'll leave them to you." She retreated into the chaotic Miasma, vanishing once again. You have no time to wonder where she went, as an immediate crisis looms before you... Your exploration reaches its end as you finally see it — the Miasmic Fiend emerging from the distance... |
Indeed! The Miasma creatures need memories as raw material, and offering those memories presents the best chance to get close to her. You follow the other believers forward, consciously avoiding any painful memories of the past... You desperately fill your mind with fragments of happiness. You even begin silently reciting the names of your loved ones, and those moments of mutual dependence shine especially bright in this instant. You successfully approach her... She's close enough now! You strike at her, attempting to gravely wound this broken soul that contains nothing but flames of vengeance within. You realize... What stands before you is no longer purely "human," but rather a convergence of iron will, existing only to question the entire world. As the exploration draws to a close, you finally see it — The Defiler appearing in the distance... |
Last Node
Ending #1 - Pathfinder (Wandering Hunter)
- 4-1
- 4-2
- 4-3
- 4-4 Optional
- LAST NODE Final
| 4-1 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] LAST NODE stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| 4-2 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] LAST NODE stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| 4-3 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] LAST NODE stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| 4-4 Optional | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] LAST NODE stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| LAST NODE Final | |
|---|---|
Details:
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| — | |
| Wave 3 | Wave 4 |
| — | — |
Ending #2 - Devoured (Miasmic Fiend)
- 4-1
- 4-2
- 4-3
- 4-4 Optional
- LAST NODE Final
| 4-1 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] LAST NODE stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| 4-2 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] LAST NODE stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| 4-3 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] LAST NODE stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| 4-4 Optional | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] LAST NODE stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| LAST NODE Final | |
|---|---|
Details:
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Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| — | |
| Wave 3 | Wave 4 |
| — | — |
Ending #3 - In the Name of Legend (The Defiler)
- 4-1
- 4-2
- 4-3
- 4-4 Optional
- LAST NODE Final
| 4-1 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] LAST NODE stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| — | |
| Wave 3 | Wave 4 |
| — | — |
| 4-2 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] LAST NODE stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| 4-3 | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] LAST NODE stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| 4-4 Optional | |
|---|---|
| Details: After clearing, the score multiplier of the [Final] LAST NODE stage will be increased
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| Wave 3 | Wave 4 |
| — | — |
| LAST NODE Final | |
|---|---|
Details:
| |
Challenge Target:
| |
| Enemy Details | |
| Wave 1 | Wave 2 |
| — | |
| Wave 3 | Wave 4 |
| — | — |











































