Void

Void is a realm of endless nothingness, with all matter vanishing when the Dark Lord was slain. Only some basic scientific constants are left - enough to not immediately collapse things that move to the Void from other places. The magic was drained to a degree too, an whatever used to be the overlapping theme of this universe is gone from history.   Void is unique mostly by the virtue of being the only place in the multiverse (other than Terra where techmaturgy works on its own. Thanks to that, Mankind has deployed numerous self-sustainable space stations here after the Blackout, to use as research stations, secure bases of operations away from prying eyes of Terran society, and arsenals (of weaponry both conventional and not at all).   Today majority of this stations have been abandoned, including the arsenal ones - however, as techmaturgy, they don't really work without proper character classes outside of Void or Terra. Many access keys (allowing to use their dimensional gates) were lost in the process, often finding their way to unsavoury types. Today many of the voidstations are dens of scum and villainy, where everything can be bought or sold. Others are used by various multiversal groups of interest (for example the demon lords of Gehenna) as secret headquarters.   One is used as an unofficial forum when the leadership of all throne worlds (save for Terra) occasionally conducts diplomacy.