Primordia is accompanied by “Fallen,” a spin-off short story available as an illustrated PDF (Deutsche Übersetzung hier; traducción española aquí) or ePub (smaller resolution here). Although the story takes place after the game, it contains no spoilers, and thus can be read to get a taste of the game’s setting and themes.
"Fallen" is also available as an animated audiobook, which is split into three parts, available below:
Part 1: Awake
Part 2: Arise
Part 3: Forever Fallen
"Fallen" is also available in Italian audio as a three-part YouTube video:(,
and in German audio here: