Mastering Duet Night Abyss: A Complete Guide to Secret Letters & Efficient Farming

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Ever felt frustrated by endless gacha pulls in RPGs? Duet Night Abyss flips that entire system on its head. Instead of praying to RNG gods for your favorite character or weapon, you earn them directly through gameplay. The game’s unique Secret Letter and Covert Commission systems make farming and crafting not just rewarding, but genuinely fun.

In this guide, we’ll break down how these systems work, how to unlock them, and share efficient farming routes and tips—whether you’re a daily casual or an optimization master.

๐Ÿ’Œ The Core Systems Explained

Secret Letter Clues – Your Key Resource

Secret Letter Clues act as your main currency for progression. You’ll earn them through:

  • Daily Commissions (most reliable): 15 clues per day

  • Main and Side Quests

  • Achievements and Enemy Drops

๐Ÿ”‘ Pro Tip: You need 10 clues to buy one Secret Letter, so completing dailies consistently ensures a steady flow of resources.

Mastering Duet Night Abyss: Secret Letters & Efficient Farming Guide
Secret Letters – Targeted Rewards, Not Random Pulls

Once you’ve gathered enough clues, trade them in the Covert Commission Shop for Secret Letters. These vouchers let you target a specific type of reward:

  • Red (Order): Characters

  • Blue (Neutral): Weapons

  • Yellow (Chaos): Demon Wedges

๐ŸŽฏ Pro Tip: Focus your early Secret Letters on one or two key characters and their signature weapons. It’s better to have one powerful core team than several weak ones.

Covert Commissions – The Heart of Farming

Unlocked through the side quest “Go, Geniemons!”, these repeatable dungeons are the lifeblood of efficient farming.

  • No stamina system — play as much as you want

  • You choose your Secret Letter before each mission

  • Mission rewards depend on the type of letter used

๐Ÿ’ก Pro Tip: Each Secret Letter includes six possible rewards. At the end of a run, you’ll pick one from three random options. Gold-tier rewards (10 shards/blueprints) have a 10% drop rate — but the game features a pity system to ensure consistent progress.

Standard Commissions – The Everyday Grind

These repeatable missions unlock through the main story quest “The Art of Survival”, providing steady access to key materials:

  • Excavation: Coins

  • Hedge: Character EXP

  • Termination: Weapon EXP

๐Ÿ“˜ Pro Tip: Combine Standard and Covert Commissions in your daily rotation for a perfect balance of EXP, currency, and shards.

Thoughts & Intron System – Character Progression

“Thoughts” are essentially character shards — collect 30 to unlock a new character or enhance their Intron level for powerful stat boosts.

  • Covert Commissions are the main source

  • Each new Intron level requires 30 additional Thoughts (e.g., Level 2 = 60 total)

⚙️ Pro Tip: Focus your farming runs on characters you actively use, maximizing your efficiency over time.

๐Ÿงญ Strategic Farming for Every Player Type

For Casual Players: Smart Daily Routines

If you only have 30–60 minutes a day, here’s how to make it count:

  1. Prioritize Daily Commissions – Guaranteed Secret Letter Clues every day.

  2. Focus on Your Core Team – Build one reliable setup instead of spreading resources thin.

  3. Progress the Main Story – Unlocks more commission types and better farming zones.

  4. Tackle Weekly Challenges – Nocturnal Echoes and Mystic Maze offer full Secret Letters for steady progress.

For Efficient Farmers: Maximizing Output

Got more time or looking to min-max your runs? Here’s how to go pro:

  1. Study the Covert Commission Reward Pool – Learn which letters give your needed resources and chain those runs.

  2. Recycle Duplicates – Convert duplicate Secret Letters back into Clues — nothing is wasted.

  3. Plan Crafting Sessions – Start long forge timers before logging off so items finish while you’re away.

  4. Join Player Communities – Shared farming routes and drop-rate tracking can give you a major efficiency boost.

๐ŸŒพ The Bigger Picture: Why This System Matters

Duet Night Abyss’s crafting and farming design signals a shift toward player empowerment. By removing gacha pressure and introducing systems like Secret Letters and Covert Commissions, Pan Studio gives you control over your progression and rewards skillful play instead of luck.

This isn’t just efficient—it’s respectful game design, and it’s quickly becoming a major reason why Duet Night Abyss stands out in the crowded RPG market.   

๐ŸŒ Community & Resources Links

Stay connected with the Duet Night Abyss community for updates, tips, and exclusive rewards:

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