Unlocking new characters in Duet Night Abyss is all about understanding its unique Secret Letter system. While the game has completely removed traditional gacha pulls for characters, you’ll still need to grind strategically across various missions and events to build your roster. Every character in DNA can be earned for free, and once you learn how the system works, you’ll be able to recruit new heroes at your own pace without spending a dime.
How to Use Secret Letters to Unlock Characters
Every playable character in Duet Night Abyss is tied to Secret Letters and Thoughts.
Secret Letters are special items that serve as the gateway to unlocking characters, weapons, and upgrades. By using them in Covert Commissions, players can earn character Thoughts — collectible fragments that are required to recruit new characters.
Each character requires 30 Thoughts to be unlocked through the game’s Reminiscence feature in the Armory menu. Extra Thoughts can be used to enhance Introns, which work like Constellations or Eidolons, improving skills and adding new effects.
How to Get Secret Letter Clues
Before you can start farming for Secret Letters, you’ll need Secret Letter Clues — the base currency for obtaining them. Clues can be found throughout the game, but some activities are more efficient than others.
- Daily Commissions: Completing all dailies rewards about 15 Clues per day, ensuring a steady income.
- Main and Side Quests: Progressing through storylines regularly grants Clues as completion rewards.
- Event Modes: Limited events like Immersive Theater and Nocturnal Echoes offer large Clue payouts.
- Achievements and Exploration: Opening chests and clearing certain zones can drop bonus Clues.
Ten Secret Letter Clues can be exchanged for one Secret Letter through the in-game shop. Focusing on daily missions early on ensures consistent progress even when you’re not playing for long sessions.
See also: Duet Night Abyss Characters Tier List: Best DPS, Support, and Team Picks for Global Launch
How to Use Covert Commissions to Unlock Characters
Once you’ve secured Secret Letters, the next major step is participating in Covert Commissions. These missions are the core progression system for unlocking characters and equipment.
Commissions are available under the Combat menu and rotate hourly. They’re divided into three categories:
- Character Commissions: Focused on earning Thoughts for characters.
- Weapon Commissions: Drop weapon blueprints.
- Demon Wedge Commissions: Provide upgrade materials for enhancing builds.
At the end of each mission, players choose between three random rewards tied to the Secret Letter used. Rewards are split into three rarity tiers:
| Tier | Reward | Description |
|---|---|---|
| Gold (I) | 10 Thoughts | Rare drop, highest unlock progress. |
| Silver (II) | 2 Thoughts | Common mid-tier reward. |
| Bronze (III) | EXP materials | Used to level up characters. |
Higher difficulty and better performance increase your chances of securing Gold-tier rewards. Most players will spend several hours across different commissions to collect the 30 Thoughts needed for each character.
Story Progression and Event Rewards
Not every character requires grinding commissions. Several key heroes are obtainable simply by progressing the main story or joining timed events. Here’s a summary of free unlocks available at launch:
| Character | How to Unlock |
|---|---|
| Margie | Unlocked automatically during the prologue. |
| Rebecca | Rewarded via story progression and in-game mail. |
| Berenica | Given to pre-registered players. |
| Truffle & Filbert | Obtained after completing Go, Geniemons! and the Covert Commissions Tutorial. |
| Psyche | Earned through the Immersive Theater event. |
| Lisbell | Available after clearing Mystic Maze I–VI. |
| Daphne | Unlocked during The Overlookers main quest. |
| Outsider | Gained after finishing the Prey vs Hunter storyline. |
Each major update adds new events or limited modes that feature specific characters. For example, Immersive Theater highlights a single new hero for 28 days before rotating them into the Nocturnal Echoes boss rewards and eventually the shop.
Premium Options and Alternative Unlocks
Although all characters can be obtained for free, players who want to speed things up can use Phoxene Plumules, the game’s premium currency.
- 4,500 Plumules will instantly unlock one character.
- 150 Plumules can purchase a single Thought.
This option exists purely for convenience — there’s no pay-to-win advantage since every item is still accessible through gameplay.
Duet Night Abyss Character Farming Tips and Tricks
- Focus on one target character rather than splitting Secret Letters among multiple heroes.
- Complete Daily Commissions before anything else for a reliable source of Clues.
- Join Immersive Theater and Nocturnal Echoes weekly, as they provide the best event-based rewards.
- Keep checking the shop, since some Secret Letters appear temporarily at reduced Clue cost.
- Use your strongest team in Covert Commissions to improve your Gold-tier drop rate.
What makes Duet Night Abyss stand out is its commitment to fair and accessible progression. There’s no random character gacha, no limited-time paywalls — just consistent grinding and smart resource use. Each Secret Letter and commission run brings visible progress toward your desired hero, making roster building both rewarding and transparent.
By learning how to balance Clue farming, mission selection, and event participation, players can unlock the full cast of Duet Night Abyss completely free, enjoying a system that rewards effort over luck. Play Now!
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