Act 5: Final Area - Subway Train & Arena
The final act of Post Trauma begins with Roman in a subway train, where your actions directly influence the game's ending. You can control the train's speed using the directional pad: pressing up circles the handle left to speed up the train, while pressing down circles it right to slow it down. Jill will eventually appear at the front of the train. If you speed up the train and kill Jill, you achieve Ending A. If you slow down the train and save Jill, you get Ending B. After this segment, cutscenes lead to the final battle.
The final boss, "Abomination," is encountered in a large circular arena. This encounter is more of a puzzle than a traditional boss fight, as direct attacks are ineffective. During this battle, you can switch between Roman and Freya by tapping the RB button when Roman is holding a lever. Freya is positioned on a high walkway, while Roman operates levers. The Abomination itself is described as a large tentacle-like creature.