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Duet Night Abyss (Chinese: 二重螺旋; pinyin: Erchong Luoxuan; lit. ‘Double Helix’) is a 2025 free-to-play action role-playing game developed by Pan Studio and published by Hero Games. The game supports switching between melee and ranged combat while employing a dual-protagonist narrative structure.

Set on Atlasia, a continent where magic and machinery coexist, as the gameplay setting. Players experience the story through two protagonists from different social backgrounds, interacting with rival factions and engaging in exploration and combat within the in-game world.

The developer removed partial gacha and the stamina systems based on feedback from two closed beta tests prior to the game’s release. The game was released on 28 October 2025.