In Duet Night Abyss, players can use the Intron system to boost their characters' stats and skill effects. This system resembles a "rate-up" or power-up mechanic common in gacha games but without the paywall, focusing instead on farming to enhance characters.
What Intron means in Duet Night Abyss
Introns serve as an additional upgrade path that enhances character potential beyond the base level. For example, raising a character's Intron level can increase weapon critical chance, skill damage, or provide other buffs depending on the character.
Intron upgrade costs
Once you unlock a character and acquire 30 Thoughts specific to that hero, you gain access to your first Intron level upgrade. Each subsequent Intron level requires an additional 30 Thoughts, meaning Intron Level 2 needs 60 total Thoughts, Level 3 requires 90, and so on. This cumulative system means players work toward a single goal each time they decide to push a character's Intron progression.
You can also use Phoxene Plumule for character level progression. You'll need 4500 Phoxene Plumule to complete the upgrade.
When using Thoughts to upgrade Introns, each additional Thought you possess will reduce the Phoxene Plumule cost by 150. So you can have a hybrid spending option for Introns.
Thoughts act like character shards and are farmed primarily through gameplay activities such as Covert Commissions and events. Players accumulate these shards and use them in the Armory screen to unlock or level up characters' Introns.
How to farm Thoughts and unlock Introns
Step 1: Acquire Secret Letter Clues
Begin your Intron farming journey by accumulating Secret Letter Clues through daily commissions, side quests, chest exploration, and event participation. Daily Commissions are the most reliable source, providing 15 clues per day. You need 10 clues to purchase one Secret Letter from the shop.
Step 2: Purchase character-specific Secret Letters
Visit the Covert Commissions shop tab and use your Secret Letter Clues to buy the Secret Letter for the character you want to strengthen with Introns. Store availability varies - some characters appear in the rotating Covert Commissions shop, while others are gated behind endgame content like Immersive Theater and Nocturnal Echoes.
Step 3: Activate Covert Commissions with your Secret Letter
Select your target character's Secret Letter before launching a Covert Commission mission. These instanced missions cycle through different types every hour, rotating between character farming, weapon farming, and Demon Wedge gear farming. You can tackle these solo or cooperatively with friends.
Step 4: Collect Thought rewards from missions
Upon completing a Covert Commission, select from three reward tiers: Gold (10 Thoughts), Silver (2 Thoughts), or Bronze (materials). Gold rewards carry a 10% drop rate, but the game features a pity system ensuring you'll eventually receive gold-tier rewards regardless of luck. Estimated active farming time per character is roughly one hour.
Step 5: Use Thoughts to unlock your next Intron level
Once you accumulate the required Thoughts for your target Intron level, navigate to the Armoury screen and select the character. Confirm the upgrade, and your character's new Intron level activates immediately with all associated bonuses and ability enhancements.
Character performance scaling through Introns
Intron level progression significantly impacts character performance in combat encounters. Character tier list placements shift as Introns increase, particularly for characters that come online at higher levels. Some heroes remain strong from Intron 0 onwards, while others transform into competitive powerhouses only after reaching Intron 4 or higher. Characters like Rebecca, Daphne, and Berenica maintain strong positions throughout Intron scaling, while choices like Lynn become competitive DPS options only after significant investment in Intron levels.
Example character - Berenica's Intron progression
Berenica is an S-tier mobility DPS character who benefits significantly from Intron upgrades. At Intron level 6, she retains her core strengths but benefits from buffs like increased critical chance on exiting stealth or enhanced skill cooldowns. Investing in Introns maximizes her combat efficiency and versatility in battle.
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