Play Chapter 12 and Its Combat Missions
Astral Chain’s story is made up of 11 different Files, basically chapters by a different name. However, what you might not know is that there’s actually a File 12 to play, started by simply loading up your cleared save data.
While this File doesn’t have a story to play through, it does provide you with a ton of different combat missions to play through.
These missions can be undertaken by talking to Olive in the Command Room, and each one pits you against a tough series of enemies. To make things more difficult you have a pre-selected group of items in each mission, and you won’t have access to your own inventory.
These missions are the most challenging sequences in the entire game, and they’re the main post-game feature you’ll want to play through.
Just make sure you’re ready, so you might need to level up your Legion and weapons first.