Okay so to start off, Remnants are like, little notes or journal entries uncommon from different planets, they can pertain to the following-
1. Astrology, records from ancient races on the stars and their perceptions on them.
2. Religion, how ancient races believed in their creation.
3. War, ancient records of disputes, the amount of time they lasted, and even casualty lists.
4. Literature, ancient race's forms of poetry, writings, and even short stories of myths and the real world.
Their would even be logs that continue, as an example, you would find one log from a person, such as a casualty list early in the war, then you can eventually find another log from mid-way in the war, even on another planet, which could leave the player wondering how the log got their, and even the writers travels. You can even make your own logs which can be discovered by other players or even yourself in another playthrough!
Anyway, that's my idea, hope you guys like it, sorry I don't elaborate, still working on getting the hang of that, anyway if you have questions or comments, put them below, see you guys later and good luck.