The Abyss is So Huge

In countless legends surrounding Abyss and demons, the survivors would always fearfully describe those monsters as such: body of flames, toxic, hulking, and ferocious. And demons were certainly such beings.

Virtually all monsters from the Abyss possessed powers related to toxic and flames. Their flesh was sturdier than iron, and every species apart from imps and worms were more than two meters tall. Born with bizarre souls, they could unleash terrifying magics in the Abyss, and though they could still manipulate mana in the normal plane their abilities were largely suppressed.

While that may be the case, their power was so terrible that they were feared widely in the outside world.

The demonic races are so diverse that even abyssal worms, the basest species of the lot, had unusual mutations, much less other higher races. However, the most famous and most powerful demons were the Abyssal Balrogs.