The Black Abyss, also known as Great Expanse, is the empty void between worlds. It is described as the first of everything when there was nothing, and is part of the primary Material Plane. It is essentially the name given to outer space in the Allenia & Septiino Universe

to date, two planets have been specified in the Arcanic / Septiino universe: Allenia / Septiino: However, countless other planets exist in the Abyss

The Black Abyss is also home to the creatures of disorder, destruction and chaos and thrive in the utter darkness that the void provides.