COSM-GAME
Duet Night Abyss 1.6 Adds Falsi and Mount Arcano
Duet Night Abyss released Paradise's 22nd White Bunny on September 8, 2026, expanding the game with the Pyro character Falsi, Mount Arcano and three new weapons. The update permanently opens Arcano, Arcano Ruins and Mount Arcano Rift, adds Twilight Arc Chapter 2 and introduces Stifled Howl, Sanguis Sanctus - Whipblade and Sanguine Plume. Falsi can be obtained through gameplay after the version update or purchased from the Shop.
Game summary
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Version 1.6 Expands Several Parts of the Game
Paradise's 22nd White Bunny launched on September 8, 2026 as the next major Duet Night Abyss version. Its central additions cover a new playable character, a permanent exploration region, three weapons and another chapter of the Twilight Arc.
| Version addition | Content |
|---|---|
| Character | Falsi |
| Region | Mount Arcano |
| Main story | Twilight Arc Chapter 2 |
| Weapon | Stifled Howl |
| Weapon | Sanguis Sanctus - Whipblade |
| Weapon | Sanguine Plume |
| Side content | Paradise Falls and new Sojourns of the Pages of Time |
The central character, map and story additions remain available after the initial version launch. Separate version events and rotating rewards use their own schedules.
Falsi Joins as a Pyro Character
Falsi is the new playable character for the version. She is a Pyro character from the Imperial Army 13th Legion and has proficiency with Dual Blades and Dual Pistols.
| Falsi detail | Value |
|---|---|
| Element | Pyro |
| Affiliation | Imperial Army 13th Legion |
| Weapon proficiency | Dual Blades and Dual Pistols |
| Release date | September 8, 2026 |
| Availability | Permanent after the version update |
| Gameplay acquisition | Covert Commissions and Secret Letter progression |
| Alternative acquisition | Shop purchase |
Secret Letter: Falsi enters the Immersive Theatre limited-time reward rotation after the update. Secret Letter: Stifled Howl is added to the same rotation.
Falsi also receives a new Sojourns of the Pages of Time story. Completing its stages provides Secret Letter Clues, while reading the complete story unlocks an achievement reward tied to Falsi.
Mount Arcano Opens as a Permanent Region
The new exploration area Mount Arcano is located in the southern mountain range of Flagson. The area was affected by the war between Hyperborea and the Elysian Church four years earlier, leaving human activity in the mountains greatly reduced.
| Mount Arcano area | Role |
|---|---|
| Arcano | One of the new explorable areas |
| Arcano Ruins | Ruined section of the new region |
| Mount Arcano Rift | Additional explorable section of Mount Arcano |
The region is permanently available after the version update. It provides the setting for the next Twilight Arc story chapter rather than functioning only as a temporary event map.
Three New Weapons Join the Version
Paradise's 22nd White Bunny introduces three weapons covering three different weapon categories.
| Weapon | Type | Availability |
|---|---|---|
| Stifled Howl | Dual Blades | Gameplay acquisition and Shop |
| Sanguis Sanctus - Whipblade | Whipblade | Version weapon acquisition routes |
| Sanguine Plume | Calamity Weapon, Dual Guns | Version activity and related acquisition routes |
Stifled Howl receives a Secret Letter route in the Immersive Theatre rotation. The wider weapon rollout continues Duet Night Abyss's gameplay acquisition model rather than making the new version depend only on Shop purchases.
Twilight Arc Chapter 2 Continues the Story
Twilight Arc Chapter 2: Paradise's 22nd White Bunny becomes permanently available with the update. Mount Arcano and its damaged surroundings form the main setting for the new chapter.
The version also adds the side story Paradise Falls and new Sojourns of the Pages of Time content for Eve and Falsi. These additions give the new region and character their own narrative content beyond exploration and combat progression.
The Version Also Expands Activities and Systems
The September version contains a large event schedule in addition to its permanent content. Activities include Way of the Penitent, Parade Itinerary, Opulent Rebate, Better Luno than Never, Vibrant Strokes and Moments in Frames, with different start and end times.
Immersive Theatre also rotates its recommended elements and Stage Scores. The new Secret Letters for Falsi and Stifled Howl join the applicable limited-time reward pool.
A Matching Lobby is among the version's broader system additions, while other progression changes affect repeated battles, companion combat and weapon proficiency options.
Note: Falsi, Mount Arcano and the new permanent story content do not share the same expiry rules as temporary version events. Check each event notice separately for its own deadline.
FAQ
7 questionsParadise's 22nd White Bunny released on September 8, 2026 as the new Duet Night Abyss version.
Falsi is the new Pyro character introduced with the update. She is affiliated with the Imperial Army 13th Legion and has proficiency with Dual Blades and Dual Pistols.
Falsi becomes permanently obtainable after the update through gameplay using Covert Commissions and her Secret Letter route, with direct Shop purchase also available.
Mount Arcano includes Arcano, Arcano Ruins and Mount Arcano Rift.
The update adds Stifled Howl Dual Blades, Sanguis Sanctus - Whipblade and Sanguine Plume, a Calamity Weapon using Dual Guns.
Yes. Twilight Arc Chapter 2 and the new Mount Arcano exploration content become permanently available after the update.
Secret Letter: Falsi and Secret Letter: Stifled Howl are added to the limited-time Immersive Theatre reward rotation after the September 8 version update.