Atelier Shallie: Alchemists of the Dusk Sea is the sixteenth game in the Atelier series and the third game in the Dusk subseries. The game takes place after the tragic conclusion of the Age of Alchemy, where the world runs dry, seas turn into deserts, and monsters run rampant. Two alchemists, Shallistera (Shallie) and Shallotte Elminus (also Shallie), meet at an oasis town where the water sources dry up.
The story follows the two alchemists as they embark on separate adventures, with the player choosing one of them to start the game. The initial choice has a distinct impact on the story, even though they eventually meet and need to work together and bond. The plot is split up into several chapters, where specific tasks need to be completed for the Stellade merchants' association.
The gameplay focuses on life tasks, quests, and missions similar to the assignment board in Atelier Escha & Logy: Alchemists of the Dusk Sky . The player can freely explore the environment to gather items and harvest raw materials for mixing. Tasks vary based on the chosen character and change based on the play style. For instance, players focusing on combat will more often be given battle-related tasks.
Items are created through blueprints and ingredients, with the order of selection influencing their effect. The player can also combine items to create new ones. A Chain system is used, which influences the effect of skills and can be built up by using skills of the same elements.
The game features a turn-based battle system with a party of up to six characters, including two additional ones that can only be accessed through DLC. The combat system has been simplified, with assist attacks introduced later in the game. A Burst gauge is filled through consecutive attacks, allowing for special skills and effect boosts. 
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