Scorn

The story is set in an undetermined location apparently following a devastating war. The silent humanoid protagonist first awakens and attempts to cross a wasteland called The Field heading towards the looming citadel called The Crater seen in the distance. While making its way to The Crater, the protagonist falls down a crevasse into a factory called the Assembly, a recycling plant that repurposes living things. While traversing the facility, the protagonist gradually acquires various weapons and tools which allow it to manipulate the facility's technology. Once it reaches the heart of the facility, the protagonist causes the heart's arteries to burst which knocks it unconscious and covers it with fluid. At this point, the protagonist seemingly faints while a being similar to the protagonist awakens and emerges from an egg-like shell structure elsewhere. The new protagonist makes its way to The Crater, which has seemingly been infested with hostile entities.
In the Crater, the protagonist is attacked and infested by a parasite, which allows the protagonist to use several weapons and machines, but regularly wounds it and sprouts tendril-like appendages that gradually cover the protagonist's body. The infested protagonist reaches a central elevator that has been enveloped by a massive creature with a vaguely humanoid head called "The Crater Queen". Reactivating the elevator apparently kills the Queen but allows the protagonist access to a monorail to reach a temple called Polis.
While the protagonist is exploring the temple, the parasite nearly fully envelops it, forcing it to use a machine to remove the parasite. During this process, it is heavily implied that the parasite is actually the first protagonist who mutated when the Assembly heart burst. Just before it is removed, the parasite disembowels the protagonist, who staggers to another medical device that connects it to an apparent hive mind within the temple. Controlling two androids called Shells, the second protagonist attempts to carry its own body towards a swirling energy field, but gets attacked and infected by the parasite before it can reach the field. With the parasite now merged with the protagonist, the two form a mass of seemingly immovable flesh.