Duet Night Abyss is out globally on Windows, iOS, and Android, with a notable twist: all characters and weapons are free to unlock, and progression is built around repeatable missions rather than paid banners. Cosmetics still use a gacha, but the core roster and gear are earnable through play.

What the game is at launch

This is a free-to-play action RPG set on Atlasia, a world where magic and machinery coexist. You can switch between melee and ranged combat on the fly, and the story uses a dual-protagonist structure seen through two different backgrounds. Movement includes a fast traversal move called Helix Leap, and you can bring two AI companions into combat. The game features open-world elements. Release date: October 28, 2025.

Character unlocks: the core loop

There are 18 playable characters at launch. You’ll unlock a large portion just by completing the main story, with the rest obtainable via repeatable missions and currency you earn in-game. The key system:

  • Secret Letters: consumed to claim rewards after specific missions.
  • Covert Commissions: level 40 missions that serve as the primary farm for characters, weapons, and Demon Wedges.
  • Thoughts: character-specific drops; 30 Thoughts unlock a new character.
  • Introns: post-unlock character enhancements you continue to farm; these are meaningful power boosts.

Plan on finishing the story and building your starter before settling into Covert Commissions; they’re tuned for late early-game/early mid-game power.

Covert Commissions explained

Covert Commissions come in three types — Character, Weapon, and Demon Wedge — and rotate hourly. You pick a Secret Letter, complete the mission, and then choose one of three items from that Letter’s loot pool.

  • Gold-tier rewards (like 10 Thoughts) have low odds; expect several runs to hit a character unlock.
  • Weapons and Demon Wedges unlock once you get their blueprint; the same Letter pool also drops the materials needed to craft them.
  • Objectives vary (escort, elimination, etc.), and the type rotates without changing the reward pool.

How to get Secret Letters (and Clues)

One Secret Letter costs 10 Secret Letter Clues. You’ll exhaust early freebies quickly, so ongoing sources matter. The most reliable activities at launch:

Activity What you get Notes
Main story, major side quests Secret Letter Clues Early game priority; fuels initial Letters
Daily objectives 15 Secret Letter Clues per day Consistent baseline income
Mystic Maze (weekly) 30 Secret Letter Clues Roguelike mode
Immersive Theater (rotating) Up to 280 Secret Letter Clues per refresh High-end challenge; key for new characters
Nocturnal Echoes (weekly bosses) Secret Letters for the newest characters Weekly cadence; target farming
Tip: Log in, clear dailies, then spend time on Immersive Theater if you can push high ratings; the payout accelerates unlocks.

Targeting new characters

Even without character gacha, new heroes follow a time-limited rotation for their Secret Letters:

  • First 28 days: featured in Immersive Theater as reward Letters.
  • After 28 days: moved into Nocturnal Echoes weekly boss rewards.
  • Later: added to the Secret Letter Clues shop.

At launch, Psyche is featured in Immersive Theater, with 65 Secret Letters available there and 50 Secret Letters for her signature weapon. During the same window, Nocturnal Echoes weekly bosses reward Secret Letters for Tabethe, Truffle and Filbert, Yale, and Rhythm. A strong team that can full-clear Immersive Theater is the fastest way to secure the newest character; otherwise, you can wait for the shop rotation.

Cosmetics, currencies, and pity

Characters and weapons don’t use gacha; skins and cosmetics do. Access cosmetics under Myriad, where there are limited and standard banners with separate currencies:

  • Prismatic Hourglasses: limited-time outfits.
  • Pristine Hourglasses: standard banner cosmetics.

You can earn Hourglasses in events and login rewards, or buy them with the paid currency. There are also direct-purchase seasonal skins; at launch, a Christmas-themed outfit is available at a low introductory price and works on any character.

Cosmetic gacha rule Detail
10-pull guarantee One purple-rarity item every 10 pulls
Hard pity After 90 pulls, 25 Iridescent Prisms guaranteed
Featured skin cost 25 Iridescent Prisms in the Prism Exchange
Gold-rarity drop rate 0.3% (featured outfit, 25-Prism bundle, 50-Prism bundle)
Soft pity None
Pity scope Banner-specific; does not carry over

In practice, you either hit the featured cosmetic outright, win a Prism bundle that lets you buy it, or reach hard pity to exchange for it.

Weapons, Demon Wedges, and crafting

Weapons and Demon Wedges are part of the same Covert Commission and Secret Letter ecosystem. You only need a blueprint drop once to unlock crafting for that item; farming then shifts to materials, which come from the same Letter pool.

Story length and launch state

The complete story content available at launch typically takes about 10–12 hours, depending on playstyle. The team has acknowledged and is investigating some frequently reported issues on launch; expect fixes to roll out as those are resolved.

Quick reference

Item Detail
Platforms Windows, iOS, Android
Release date October 28, 2025 (global)
Monetization Characters and weapons free to unlock; cosmetics via gacha or direct purchase
Playable characters at launch 18
Combat On-the-fly melee/ranged switching; two AI companions
Traversal Helix Leap for rapid movement
World/story Atlasia setting; dual-protagonist narrative; open-world elements

If you’re starting fresh, finish the main story to power up, convert your Clues into Secret Letters, and then live in Covert Commissions and Immersive Theater to target the characters you want. Cosmetics are optional and predictable thanks to hard pity and a Prism exchange — the roster is the grind, not the gamble.