Otherspace

Otherspace was another universal dimension existing beyond realspace, hyperspace, subspace and even the great intergalactic void between galaxies. Very few denizens of the galaxy have ever witnessed Otherspace, and those that had were known to have described it as a vast stellar expanse of storm-gray nothingness. However, Otherspace did contain colored, swirling nebulae, and dark stars which were described as "shining holes of darkness". Black holes were extremely common in Otherspace, but had drastically different physical effects in space than black holes did in the galaxy, such as their visibility in the gaseous nebulae, the significantly reduced gravitational effects on matter, and the degree of radiation expelled from them.

Dark matter was extremely concentrated in Otherspace, as was dark energy and pockets of anti-matter. Many species were known to have existed in Otherspace at one point in time, but were all eventually driven to extinction by the genocidal crusade of the Charon Dominion, who wiped out all other species with the exception of a select few vassal species. For most of galactic history, only very unique circumstances opened a "breach" between the galaxy and Otherspace, although the Aperture created a permanent wormhole of sorts that allowed transit between Otherspace and the rest of the galaxy. The creation of the Aperture led to the Extant War, between the Charon Dominion and the populations of the galaxy, and saw the first long-term, if fragile, alliance between the Jedi Order and Sith Order, as well as many other governmental powers. At some point during the Extant War, an invasion of Otherspace was attempted with "disastrous results" being the outcome, although no further information about the incursion was revealed.

It is believed that the nature of Otherspace was so drastically different than the galaxy, that its perpetual darkness and interstellar disturbances had such grave psychological impacts that it gradually transformed the non-native precursors of the Charon into what they were. Although the Charon species was brought to extinction, the vassal species that overthrew them, namely the now-dominant Humans, were also believed to have been a product of this, having been psychologically warped into "twisted death worshipers".

The Aperture within the Kathol Rift is the only known permanent bridge between the galaxy and Otherspace, although there has been known to be at least one other breach between the galaxy and Otherspace, in the Moddell Sector, near the forest moon of Endor. Known only by its moniker of "Otherworld", it was described as "a devastated wasteland filled with bones of dead animals and no vegetation". Likely a graveyard world brought about by the Charon crusade, the actual identity of the planet was never discovered.