Upon activating the Embrace in each of the three Realms, the player finds a door to a hidden lift in the center of the Swan, leading them deeper into the structure. The Mentor beseeches the player to complete the mission by activating the spires to 'Awaken the Embrace'.

By the time it was done, only twelve Keepers remained, and Turner ruled over them as a self-proclaimed god. Turner's arrival disrupted the Keepers' mission, leading to conflict. As the story progresses, the Mentor explains that she and the other Keepers were 'keeping the mission' until the coming of the 'Arrivers', led by a man named Turner. The Mentor directs the player to raise control spires in each of the three Realms by reaching their Arches, the main control centers in each Realm. The player is awakened in a bunker in Curievale, where they are greeted by the Mentor, who explains they have awakened them from 'the Threshold'. Throughout the game, the only interaction the player has is with 'the Mentor', the ghost of a deceased Keeper, who provides tips for early puzzles and backstory for the game world. Completing the story in each of the three Realms activates the Adjunct's upgrades: One to apply greater torque to heavier locks, one to concatenate multiple sockets, and one that increases the distance the Adjunct can access a socket. The player is equipped with a Personal Maintenance Adjunct, a mechanical gauntlet that allows them to interface with sockets for opening doors and operating machines. These realms are connected by 'Conveyance Pods' through a central hub known as 'the Swan'.

The player takes the role of a 'Keeper', charged with maintaining the three 'Realms' that make up the 'Firmament Project': Curievale, an ice mine for fresh water to power a steam plant Juleston, a sulphur mine and power station and St. It was released on Windows PCs on May 18, 2023.

Similarly to their 2016 title Obduction, it was funded by a Kickstarter campaign beginning in 2018. Firmament is an adventure video game developed by Cyan Worlds.

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