Key Terms You’ll See In-Game

Secret Letters

Special items used to claim rewards after missions (especially Covert Commissions). They effectively decide the reward pool you can roll for at the end of a run.

Secret Letter Clues / Scarlet Letter Clues

You collect clues from many activities and exchange them into Secret Letters. (The game’s UI and guides sometimes use both “Secret” and “Scarlet” wording for clues.)

Covert Commissions

Repeatable missions (often described as rotating objectives) where you spend a Secret Letter to generate a reward selection at the end. They’re a primary path to character progress materials.

Thoughts

Character-specific materials used to unlock that character. You generally need 30 Thoughts to unlock one character via the unlock system.

Reminiscence

The unlock action/feature that consumes your Thoughts to actually add the character to your playable roster.

Phoxene Plumules

Premium currency that can be used as an alternative route (for example, purchasing a character directly or buying missing Thoughts) depending on what you’re short on.

Nocturnal Echoes

A boss-focused mode with weekly reward limits that can help you target certain Secret Letters and progress character unlocks, but it’s capped per week.

Mystic Maze & Immersive Theater

Modes tied to weekly/refresh rewards and limited-time character access windows. These are the modes that can make the difference between unlocking “eventually” vs unlocking “soon.”

The Core Loop That Unlocks Characters

If you want a clear mental model, think of it like this:

1) Farm Clues

You earn clue currency from story progression, side quests, dailies/weeklies, and endgame modes.

2) Exchange Clues for Secret Letters

Once you have enough, you convert clues into Secret Letters that align with the character path you’re targeting.

3) Run Covert Commissions

You complete the mission, then your Secret Letter presents reward choices. Covert Commissions rotate frequently (often hourly).

4) Collect Thoughts

Thoughts drop as part of this loop (often as a rarer reward tier), and you stockpile 30 Thoughts for the character you want.

5) Use Reminiscence to Unlock

Once you hit the threshold, you finalize the unlock through Reminiscence.

That’s the “legit” path. It works. The problem is that it’s easy to waste time if you run the wrong missions, forget weekly caps, or don’t prioritize your clue income correctly.

Why “Free to Unlock” Still Feels Like a Grind

Even with a non-gacha character system, you’re still dealing with:

• Drop rates and reward tiers inside the commission reward pool (so you may finish many runs before getting meaningful Thought progress).
• Weekly caps on certain high-value activities (so missing a week can set your character plan back).
• New character availability windows, where the newest releases may be limited to specific modes before they enter wider circulation.
• Build checks—some mission content is simply faster (and safer) with a developed account setup.

This is exactly where BoostRoom helps.

BoostRoom Unlock Duet Night Abyss Characters Service

BoostRoom is built for players who want specific characters unlocked without spending weeks learning every optimization trick, juggling weekly limits, and repeating the same commissions inefficiently.

What BoostRoom Does for You

• Targeted farming of Secret Letter Clues / Scarlet Letter Clues
• Efficient use of Secret Letters to focus the right reward pools
• Repeated clears of Covert Commissions to collect the right Thoughts
• Completion of key weekly content such as Nocturnal Echoes (within its weekly attempt limits)
• Event/refresh content support (where character progress is featured)
• Optional progression help so your account is ready for faster farming

Our Promise: No Cheats, No Exploits

BoostRoom does not use hacks, glitches, bots, or anything that risks bans. We unlock characters through normal gameplay loops and smart planning.

Who This Service Is For

• You already know which character you want, but you don’t have time to grind 30 Thoughts
• You missed a key window and want a catch-up plan
• You’re new and want a “starter roster” unlocked quickly so the game becomes more fun
• You’re focused on endgame but need specific supports/DPS options unlocked to round out teams

What Characters Can Be Unlocked

As of mid-December 2025, major community guides list 18 playable characters (including the Phoxhunter) and also track upcoming characters and release windows.

Here are examples of playable characters commonly listed in current guides (roles and weapon pairings vary by character):

Fina, Phoxhunter, Lady Nifle, Lisbell, Psyche, Truffle and Filbert, Rebecca, Lynn, Sibylle, Tabethe, Berenica, Phantasio, Margie, Hellfire, Yale and Oliver, Outsider, Daphne, Rhythm, Randy.

BoostRoom can unlock:

• A specific single character you name
• Multiple characters as a roster bundle
• Thought completion if you’re close and just need the last stretch
• Character-ready progression so your account can farm future unlocks faster

New Character Windows and Why Timing Matters

Duet Night Abyss may avoid character gacha, but it still has a “release schedule feel.” Some new characters may appear first as limited rewards (for example, featured in a mode for a set time), then rotate into weekly boss reward pools, and later become more widely exchangeable.

That means timing affects effort:

• If you grind during the best window, you unlock faster.
• If you skip the window, you can still unlock—just with a different plan.

If you’re reading this on December 21, 2025, some guides list Fushu with a release date of December 23, 2025, and Kezhou with a release date of January 20, 2026.

BoostRoom can prepare your account for these releases by stockpiling the right currencies and organizing your weekly plan.

Two Ways to Use BoostRoom

We keep it simple, because players have different comfort levels:

Coaching Mode

You play. We guide.

• Step-by-step routine
• What to farm daily vs weekly
• Which commissions to prioritize
• How to avoid wasting Secret Letters
• Great if you prefer full control and no account sharing

Assisted Progress Mode

You want the result. We handle the grind and communicate progress clearly.

• Targeted farming toward the exact character unlock
• Efficient weekly planning (so you don’t miss limited attempts)
• Screenshot-style updates (what was completed, what’s next)

(If you’re under 18, it’s smart to involve a parent/guardian for any paid services or account-access decisions.)

BoostRoom Packages for Unlocking Characters

Below are common package styles players choose. The actual route depends on your current progress, the character, and what content you’ve already unlocked.

Popular Options

• Single Character Unlock – Best when you know exactly who you want next.
• Starter Roster Bundle – Unlock a small roster that covers DPS + support + utility so the game opens up.
• Catch-Up Unlock – You already have some Thoughts; BoostRoom finishes the last stretch efficiently.
• Weekly Routine Boost – We focus on clue income and capped weekly content so your future unlocks are easier.

Example Package Menu (Service Structure)

PackageBest ForWhat’s Included1 Character UnlockYou want one specific character nowTargeted clues, Secret Letters, commissions, 30 Thoughts plan, unlock via Reminiscence2–3 Character BundleBuilding a functional team coreMulti-target planning, optimized weekly caps, commission routing per characterStarter Roster BuildoutNew accounts or returning playersProgress support + unlocks that cover roles (DPS/support/control/heal)Catch-Up (Finish My Thoughts)You’re close, but stuckComplete remaining Thoughts via the most efficient content availableWeekly Cap OptimizationYou keep missing resetsWeekly boss attempts, weekly clue modes, daily routine structure

BoostRoom also supports add-ons like:

• Weekly Nocturnal Echoes optimization (within the weekly claim limits)
• Event/refresh mode clears when new character progress is featured
• Build readiness help so your farming runs become smoother and faster

Which Characters Should You Unlock First

If you’re early game, your best first unlock is usually the one that solves a problem:

• Can’t survive? Get a support/healer style option.
• Damage feels slow? Get a reliable DPS.
• Bosses overwhelm you? Get control/shield utility.

Some guides highlight Lady Nifle, Psyche, Lynn, and Fina as strong early priorities depending on your needs and build goals.

BoostRoom will always tailor the plan to your account—because a “top character” still needs the right team, weapon pairing, and playstyle fit to feel great.

A Clean Daily + Weekly Plan (DIY-Friendly)

If you’re unlocking characters yourself, the biggest difference-maker is consistency:

Daily Priorities

• Clear your daily objectives for steady clue income
• Spend stamina/time where the clue-to-effort ratio is best for your account
• Do not “randomly” spend Secret Letters—use them only when you’re pushing a specific character path

Weekly Priorities

• Nocturnal Echoes: plan around the weekly reward claim cap
• Mystic Maze: treat it like a weekly currency injection (don’t skip it)
• Immersive Theater (or similar refresh modes): push as high as you reliably can, because that’s where big bursts of progress can happen

The #1 Mistake

Players often farm a lot… but not in a way that stacks toward one unlock. Focus beats “a little bit of everything.”

If you want, BoostRoom can set up this routine for you so your account naturally accumulates unlock resources even on weeks when you barely have time to play.

What Makes BoostRoom Different

We Focus on Your Exact Target

Not “general farming.” Not vague progress. You tell us the character(s), and we build a plan around that unlock path.

We Respect Weekly Limits

A big portion of character progress comes from modes that reset weekly or on refresh cycles. Missing those windows is the slowest way to unlock. BoostRoom keeps your schedule efficient and consistent.

We Keep It Safe

No risky behavior, no questionable “methods,” no account jeopardy.

We Keep It Understandable

You’ll know what was done and why it matters—so even after your unlock is complete, you’re better at maintaining progress.

FAQ

Q: Is it really possible to unlock characters without gacha?

Yes. Duet Night Abyss is widely reported to let players unlock the roster through gameplay systems (with cosmetics being a separate mechanic), and guides describe character unlocks through Secret Letters, Covert Commissions, and Thoughts.

Q: How many Thoughts do I need to unlock a character?

Most current guides describe needing 30 character-specific Thoughts to unlock a character via Reminiscence.

Q: What does BoostRoom actually do to unlock my character?

We focus on clue income, exchange into the right Secret Letters, run the correct Covert Commissions, and farm until the Thoughts requirement is met—then the character is unlocked through the game’s normal system.

Q: Can you unlock more than one character?

Yes. Many players choose a 2–3 character bundle or a starter roster plan so they can build teams with better synergy.

Q: Do you use cheats, bots, or exploits?

No. BoostRoom uses normal gameplay progression only.

Q: I already have some Thoughts. Can you just finish the last part?

Yes—this is one of the most popular options because it saves time without re-doing work you already completed.

Q: Are there weekly limits that slow down unlocking?

Some modes (like weekly boss content) have weekly reward claim limits, so planning matters.

Q: Can you help me prepare for upcoming characters?

Yes. We can stockpile resources and set up your weekly routine so you’re ready when a character becomes available.

Q: Is Coaching Mode available if I don’t want anyone accessing my account?

Yes. Coaching Mode is designed exactly for that: you play, we guide, you keep full control.

Q: I’m new—what’s the best first step before unlocking characters?

Get your account stable enough to clear the repeatable content efficiently. If your clears are slow or inconsistent, unlocking will feel much harder than it needs to be.

Q: How do I start BoostRoom’s Unlock Duet Night Abyss Characters service?

Choose your target character(s), pick a package (single unlock, bundle, or catch-up), and we’ll build the fastest safe plan around your account progress.

Ready to Unlock Your Next Duet Night Abyss Character?

If you’re tired of spending your limited playtime on repeated commissions and weekly planning spreadsheets, BoostRoom will handle the grind while you enjoy the roster.

With BoostRoom’s Unlock Duet Night Abyss Characters service, you get:

• A targeted plan
• Efficient farming
• Safe, normal gameplay progression
• A roster that actually matches how you want to play

BoostRoom is the fastest way to turn “eventually” into “unlocked.”