Duet Night Abyss side quests: every Icelake mission and how to unlock

Duet Night Abyss splits optional content into two buckets: side quests that tell small stories around Icelake and special side quests that quietly unlock core systems or gate main missions. You’ll see white markers for standard side quests and blue markers for special side quests. Many appear as you advance the story; others pop when you enter specific districts or after you repeat “dynamic” errands.

Duet Night Abyss side quest unlocks (Chapter 1)

Side quests begin in Chapter 1 after completing the special side quest The Wandering Luno. From there, white quest markers across Icelake open up.
Special side quests are prerequisites for features such as forging and Geniemon capture, and they often gate the next main mission.
Some optional quests are triggered by reaching new areas or finishing key story beats; a few come from repeating dynamic events in town.

Icelake side quests list and rewards

Side quest	How to unlock	Where	Quest giver	Rewards
The Gone Girl	Talk to Elsa	Silverpeace Square, Icelake	Elsa	Coin ×1000, D10 Die ×1 Carmine Globule ×100 Weapon Manual III ×1 Secret Letter Clue ×5
Inspiration Stealer	Talk to Camilla	The Asphodel, Icelake	Camilla	Secret Letter Clue ×5 Combat Melody III ×1 Carmine Globule ×100 Coin ×1000, D10 Die ×1
The Greed Beneath the Sand	Clear The Art of Survival	The Asphodel, Icelake	Shirley	Secret Letter Clue ×5 Weapon Manual III ×1 Carmine Globule ×100 Coin ×1000, D10 Die ×1
Little Researcher I	Talk to Theo	Eastern District, Icelake	Theo	Secret Letter Clue ×5 Weapon Manual III ×1 Carmine Globule ×100 Coin ×200, D10 Die ×1
Little Researcher II	Talk to Theo	Icelake Suburban Square	Theo	Secret Letter Clue ×5 Combat Melody III ×1 Carmine Globule ×100 Coin ×300, D10 Die ×1
Little Researcher III	Talk to Theo	Hypnos’ House, Icelake	Theo	Secret Letter Clue ×5 Weapon Manual III ×1 Carmine Globule ×100 Coin ×500, D10 Die ×1
Sewer Carnival	Talk to Dutton	Eastern District, Icelake	Dutton	Secret Letter Clue ×5 Combat Melody III ×1 Carmine Globule ×100 Coin ×1000, D10 Die ×1
The Imperial Three	Clear Crystallo of Stella	Glevum Pit, Icelake	TBD	Secret Letter Clue ×5, Coin ×1000 D10 Die ×1, Carmine Globule ×100 Combat Melody III ×1
The Returnees Never Return	Talk to Ms. Sally	Eastern District, Icelake	Ms. Sally	Secret Letter Clue ×5 Carmine Globule ×100 Weapon Manual III ×1 Coin ×1000, D10 Die ×1
To Those You Miss	Talk to Emma	Silverpeace Square, Icelake	Miss Lisse	Coin ×1000, D10 Die ×1 Carmine Globule ×100 Secret Letter Clue ×5 Weapon Manual III ×1
Dead Wood in the Sewers	Clear In the Depths of Winter	Depths of Icelake Sewers	TBD	Secret Letter Clue ×5 Combat Melody III ×1 Carmine Globule ×100 Coin ×1000, D10 Die ×1 Screamshot ×1
Clock No More Ticking	Talk to Wells	The Asphodel, Icelake	Wells	Secret Letter Clue ×5 Carmine Globule ×100 Combat Melody III ×1 D10 Die ×1, Coin ×1000
Far Beyond the Sea	Talk to Brunetto	Icelake Suburban Square	Brunetto	Secret Letter Clue ×5 Carmine Globule ×100 Weapon Manual III ×1 D10 Die ×1, Coin ×1000
Hello, Icelake	Talk to Margie	Icelake Suburban Square	Margie	Secret Letter Clue ×5 Weapon Manual III ×1 Carmine Globule ×100 Coin ×1000, D10 Die ×1 Thought: Margie ×30
A Dangerous Prescription	Accept Hello, Icelake	Silverpeace Square, Icelake	Luna	D10 Die ×1, Coin ×1000 Carmine Globule ×100 Weapon Manual III ×1 Secret Letter Clue ×5
The “Final” Contract	Accept Hello, Icelake	Hypnos’ House, Icelake	Lina	Carmine Globule ×100 Combat Melody III ×1 Coin ×1000, D10 Die ×1 Secret Letter Clue ×5
The Stars of Hidden Dreams	Accept Hello, Icelake	Icelake Suburban Square	TBD	D10 Die ×1, Coin ×1000 Weapon Manual III ×1 Carmine Globule ×100 Secret Letter Clue ×5
The Unseen Horns	Clear Crystallo of Stella	Eastern District, Icelake	Faye	Carmine Globule ×100 Weapon Manual III ×1 Coin ×1000, D10 Die ×1 Secret Letter Clue ×5
The Bloodstained Stones	Talk to Larry	Icelake Sewers, Icelake	Larry	Secret Letter Clue ×5 Carmine Globule ×100 Combat Melody III ×1 D10 Die ×1, Coin ×1000
Set Sail Through a Sleepless Night	Clear Requiem for the Nameless	TBD	TBD	Secret Letter Clue ×5 Carmine Globule ×100 Combat Melody III ×1 Coin ×1000, D10 Die ×1
Scars That Won’t Fade	Talk to Lars	Icelake Suburban Square	Lars	Secret Letter Clue ×5 Combat Melody III ×1 Carmine Globule ×100 Coin ×1000, D10 Die ×1
The Melancholy of Violetta	Talk to Fane	Eastern District, Icelake	Fane	Secret Letter Clue ×5 Carmine Globule ×100 Weapon Manual III ×1 D10 Die ×1, Coin ×1000
The Sorrows of Miss Crate	Clear Requiem for the Nameless	TBD	TBD	Secret Letter Clue ×5 Carmine Globule ×100 Combat Melody III ×1 Coin ×1000, D10 Die ×1

Special side quests (Chapter 1)

Special side quest	How to unlock	Where	Quest giver	Rewards / unlocks
The Wandering Luno	Clear The Reborn	Icelake Suburban Square	Lunosmith	Blueprints: Ammo Supply Crate, Repulsive Crystal, Gold Sand, Coolant, Weapon Holder, Projectile Combat Melody III ×1, Coin ×1000, D10 Die ×1 Blueprint: Commission Manual III ×1, Commission Manual IV ×1
Go, Geniemons!	Clear The Art of Survival	Sanctuary, Icelake	Snow	Secret Letter: Truffle and Filbert ×1 Secret Letter Clue ×5 Weapon Manual III ×1 Carmine Globule ×100, Coin ×1000, D10 Die ×1 Thought: Truffle and Filbert ×1
Tutorial Quest: Covert Commissions	Clear Go, Geniemons!	Sanctuary, Icelake	Snow	Secret Letter Clue ×5 Carmine Globule ×100 Weapon Manual III ×1 Coin ×1000, D10 Die ×1
Dedicated Chef	Clear In the Depths of Winter	Zephyr Path, Icelake	Marcus	Secret Letter Clue ×5 Weapon Manual III ×1 Carmine Globule ×100 Coin ×1000, D10 Die ×1
How The Team Got Its Name	Clear The Art of Survival	The Asphodel, Icelake	Tavern Waiter	Secret Letter Clue ×5 (two bundles) Combat Melody III ×1, Weapon Manual III ×1 Carmine Globule ×100, Coin ×1000, D10 Die ×1
Master of Atlasian Aesthetics	Clear Prey VS Hunter	Sanctuary, Icelake	Amiette	Coin ×1000, D10 Die ×1 Carmine Globule ×100 Secret Letter Clue ×5, Combat Melody III ×1
Can I Keep It?	Talk to Camilla	The Asphodel, Icelake	Camilla	Secret Letter Clue ×5 Carmine Globule ×100 Combat Melody III ×1 Coin ×1000, D10 Die ×1
A New Theatrical Experience	Special side quest	Galea Theatre, Icelake	Friendly Troupe Member	Unlocks late‑game activity ties (no item list provided)

How to find side quests reliably

Watch the markers: blue (special) and white (standard) icons over NPCs signal available quests.
Advance the story: many optional quests appear after you clear specific main missions or arrive in new districts.
Revisit dynamic errands: repeating small tasks around Icelake can unlock hidden side quests. Examples include helping the cat that appears in the city center across multiple interactions, or escorting an elderly NPC near the food stall on different days.
Follow chains: “Hello, Icelake” branches into A Dangerous Prescription, The “Final” Contract, and The Stars of Hidden Dreams.

Side quest rewards explained

Trial progression: side quests grant Trial Rank EXP and frequently hand out Weapon Manuals to push character levels.
Power materials: Carmine Globules upgrade Demon Wedges; you’ll regularly pick up stacks of 100 from side missions.
Economy: Coin rewards smooth early upgrades when leveling multiple characters and weapons.
Impression rerolls: d10 dice let you retry failed Impression Checks that gate certain interactions and quests.
Occasional bonuses: some quests include blueprints or unique items; special side quests often unlock permanent features.

Main quests that hinge on side content

The Reborn will not progress until you complete The Wandering Luno (forging unlock).
Prey VS Hunter requires the Commission “Mediation” before it begins.
A Bouquet for a Maiden appears only after In the Depths of Winter, the special side quest Dedicated Chef, and reaching Trial Rank 19.

If you’re stuck at 33/35 completed in Icelake, sweep the city center for dynamic events on different days and vary your choices during the cat interaction (walking vs. feeding). Keep an eye on Suburban Square, the Asphodel, and the Eastern District; late‑chapter quests can backfill your list after major story milestones. Revisit NPCs with white markers and don’t ignore the sewer entrances and the Glevum Pit when new objectives roll in.