Every planet in the solar system had an abyss corresponding to it.
Earth under Julius faced Demon Abyss.
Uranus under Irene faced Despair Abyss.
Neptune under Ares faced Thunder Abyss.
As their names implied, each abyss had its own characteristics. It's primarily defined by the divine path the abyssals of the abyss followed.
For instance, Demon Abyss was primarily composed of abyssals in body path. This abyss resembled earth, except that everything here was much sturdier.
Down from the most normal rocks to precious metals, the materials here seemed to be affected by the massive chi body awakeners use. If it was before Blink, even the most common metals of demon abyss would trump the best alloys of mankind.
In the same vein, Despair Abyss, being the home of plantae awakeners, was one big forest.
If humans tried hard, they could at least attack the Demon abyss.