Duet Night Abyss doesn’t lock its roster behind a traditional character gacha. Every character and weapon can be earned for free if you engage with a single system: Secret Letters. The grind sits in the missions that spend those Letters and the drops they can yield, while cosmetics live on a separate gacha with its own currencies and pity rules.

Secret Letters: the path to characters, weapons, and Demon Wedges

Secret Letters are the redeemable items you spend after completing specific missions to roll on a small reward pool. Characters, weapons, and Demon Wedges all funnel through this currency. To unlock characters, you’re chasing a resource called Thoughts; collect enough Thoughts, and you recruit the character.

There’s a gate: all Covert Commissions that consume a Secret Letter are set to level 40. You’ll need to advance the story and build your starter to handle those comfortably. Most of the roster will trickle in as you play the main story, but Secret Letters are how you finish out the cast and power up your team with Intron upgrades, which significantly boost a character’s strength.

Goal What you need Where it comes from How it unlocks
New character 30 Thoughts Secret Letter reward choices after a Covert Commission Redeem Thoughts to recruit
Weapon Weapon blueprint + crafting materials Same Secret Letter pool (blueprint drops once), materials drop there too Forge after first blueprint drop
Demon Wedge Wedge blueprint + materials Same Secret Letter pool Forge after first blueprint drop
Power boost Intron upgrades Farmed via Secret Letters Permanent stat/kit increases
Note: Intron upgrades function like constellation/eidolon systems in other RPGs, but they’re earnable through play.

Covert Commissions (level 40): how the missions and reward rolls work

Covert Commissions are repeatable, level 40 missions divided into three categories: Character, Weapon, and Demon Wedge. Each run lets you consume a Secret Letter in that category for a chance at the items you care about. The mission objectives rotate hourly across categories, but the reward tables do not — only the task changes, not what can drop.

Clear a commission and you’ll be presented with three items randomly drawn from the Letter’s pool. You can pick one. The high-value drops (like a 10-Thought bundle) are rare; gold-tier rewards that deliver 10 Thoughts sit at roughly a 10% chance, and the more common items aren’t especially impactful on their own. Expect repetition.

Commission category You spend Typical rewards Rotation
Character Character Secret Letter Thoughts (for unlocks), character upgrade items Objectives rotate hourly
Weapon Weapon Secret Letter Weapon blueprints, weapon materials Objectives rotate hourly
Demon Wedge Demon Wedge Secret Letter Wedge blueprints, wedge materials Objectives rotate hourly
Tip: For weapons and Demon Wedges, you only need the blueprint to drop once to unlock forging. After that, it’s a material farm.

How to get Secret Letters and Secret Letter Clues

Secret Letters are minted by trading in Secret Letter Clues — it’s a 10:1 exchange. Early on, main story chapters and major side quests will provide a steady supply of Clues. Once you’ve cleared those, you’ll shift to a loop of daily, weekly, and endgame activities.

Activity What it gives Frequency Notes
Main story, major side quests Secret Letter Clues One-time per chapter/quest Best early-game source; fuels your first exchanges
Daily objectives 15 Secret Letter Clues Daily Baseline income; don’t skip
Mystic Maze 30 Secret Letter Clues Weekly Roguelike mode with a predictable payout
Immersive Theater Up to 280 Secret Letter Clues per refresh Timed refresh High-ceiling endgame source tied to stage ratings
Nocturnal Echoes (weekly bosses) Secret Letters for the newest characters Weekly Target-farm new unit Letters while they’re featured

Once you’ve traded Clues for Letters, pick the category that matches your current goal and start running commissions. Over time, this loop feeds new character unlocks, weapon access, and Introns.

New character rollout (28-day window) and launch targets

New characters don’t hit the shop immediately. For the first 28 days, their Secret Letters live in Immersive Theater reward tracks. After that window, those Letters move to the Nocturnal Echoes weekly boss pool. Only then do they arrive in the shop for direct Letter purchases via Clue exchange.

  • At launch, Psyche is the Immersive Theater feature. Completing those stages can net 65 Psyche Secret Letters and 50 Letters for her signature weapon.
  • During the launch window, Nocturnal Echoes weekly bosses reward Secret Letters for Tabethe, Truffle and Filbert, Yale, and Rhythm.
  • After 28 days, Psyche’s Letters rotate into Nocturnal Echoes, replacing one of the current reward characters.

Practically, this makes new characters very farmable if your team can score top ratings in Immersive Theater. If not, they’ll still enter the regular exchange in time.

Cosmetics live in Myriad: banners, currencies, and pity rules

Skins and cosmetics use a separate gacha under the Myriad menu. This system has two banner types, each with its own pull currency, an exchange shop, and a pity counter. It’s familiar if you’ve played any gacha with limited and standard cosmetic pools.

Element Details
Banners Limited and Standard, each with its own currency
Pull currencies Prismatic Hourglasses (limited outfits), Pristine Hourglasses (standard)
How to obtain In‑game events, login bonuses, or purchase with Phoxene Plumules
10‑pull floor Guaranteed purple‑rarity item every 10 pulls
Hard pity After 90 pulls, you receive 25 Iridescent Prisms
Exchange Featured skin costs 25 Iridescent Prisms; weapon skins and accessories also available
Gold drop rate 0.3% for gold items (featured outfit, 25‑Prism bundle, 50‑Prism bundle)
Soft pity No soft pity; odds don’t ramp up before hard pity
Pity scope Banner‑specific; progress doesn’t carry between banners

There are also direct‑purchase skins that skip gacha entirely. The first seasonal outfit is a Christmas‑themed skin at an introductory $1 price, and it works with any character. More paid outfits will land in the shop over time.

Get Duet Night Abyss on Epic Games Store

You can download and play on PC via the Epic Games Store listing for Duet Night Abyss. Install from the product page and sign in to begin the story and unlock the level 40 commission loop.

Install Duet Night Abyss on Epic Games Store

Prefer Steam?

If you’d rather use Valve’s client, Duet Night Abyss is also available on Steam for PC.

Get Duet Night Abyss on Steam

Once you’re past the early story and your first character can handle level 40 commissions, the loop is straightforward: turn Clues into Letters, run targeted Covert Commissions, and use Immersive Theater and Nocturnal Echoes to chase new releases. For cosmetics, plan around a guaranteed Prism payout at 90 pulls, with no soft pity and banner‑specific counters. It’s a clear split — game progression through Secret Letters, style through Myriad — and both are predictable once you’ve seen a full cycle.