Shadow Demon.

A creature from the abyss, a strange being unlike any species in the present world. Just looking at its body gives people a creepy feeling. The only known information about this creature is that it is highly aggressive and extremely dangerous.

In the past, Sky Eye has had encounters with this kind of creature. There have even been Shadow Demons in the containment units that have already been dealt with. However, the composition of their bodies is mostly made up of unknown elements from the present world, creations from the abyss that cannot be understood by the current scientific system.

Through a few rare encounters in the past, Sky Eye has come to realize that it is likely due to the influence of the unknown elements that make up their bodies that conventional weapons in the present world are greatly ineffective against these creatures. Regular individual equipment can hardly cause any damage to them, and the only ones who can effectively harm them are the Extraordinary Beings.