This article is about the revealed story in aground, for the quests NPCs give you while they talk please refer to Quests

So far it has been revealed that "Them/They" (quoting the Alchemist) have attacked people on Earth and Their spaceships/escape pods containing the survivors (including You) crashed on this Earth like planet, and that a magical husk created by those people is also on the planet, as well as the Mirrows which [spoilers] used to be evil and quote "the sacrifices made have been necessary" could mean They originally worked for "Them" [end of spoilers] are likely tied to Them as well.