=== Arc City ===A fictional high-tech metropolis located in Shenzhou introduced in Chapter IX-1. One of the few surviving cities after the 3rd Honkai Eruption that took place in 2016.=== The Deep ===A fictional underwater ruin from the Previous Era at the Mariana Trench introduced in Chapter X. Despite it being deep underwater, the place is quite well-lit thanks to bioluminescence. The Eye of the Deep, a rift linking to the Sea of Quanta, can be found here.=== Sea of Quanta ===An imaginary space that serves as a pond collecting matter and flotsam from other parallel universes.== Timeline ==The timeline of events of Honkai Impact 3rd can be referenced from its Story, Chronicles, and official manga.circa 50000 years ago: The high-tech, world-spanning human civilization of the Previous Era was defeated by the Honkai. The survivors went on to find the Current Era (modern world).2717 BC: The first instance of Honkai-infested animals (Honkai beasts) was recorded.