However, one of their greatest characteristics was that the magic runes on the armor of the Abyssal Shield Demons would resonate with each other, and the power of the defensive force field would overlap to create an even stronger one. Legend had it that if the defensive force fields of hundreds of level-15 Abyssal Shield Demons were overlapped, offensive spells below the Sanctuary-realm would not be able to shake the force field at all. If there were 1,000 of them, even a Sanctuary powerhouse wouldn't be able to do anything to them. No one knew the origin of that magic rune, and even a Master of Inscription could not replicate it, so perhaps it could only be called a miracle of nature.
The magical rune was the reason the Abyssal Shield Demons could be found in every corner of the Endless Abyss, and rumor had it that the largest group of Abyssal Shield Demons lived in the deepest part of the Abyss, where even the gods did not dare to set foot in.