For example, an ordinary human at adulthood is a level 1, common-rank individual with average attributes of 14.
When faced with these Eye Demons, they would be utterly slaughtered.
Moreover, Eye Demons are born with the ability to manipulate Spiritual Energy. While their control is crude and they aren't as strong as the elite soldiers in Lin Yu's territory, it's more than enough to handle the weapons of an ordinary world.
Furthermore, once an Eye Demon invades a living creature, it can rapidly absorb the host's flesh and blood to split into multiple lower-level Eye Demons.
Combined with their ability to parasitize and control living creatures...
To sum it up, if an Eye Demon ever entered an ordinary mortal world, it wouldn't take long for all life on that world to be enslaved.
'What a terrifying race. If we hadn't been so cautious, many of our soldiers and heroes would probably be under their control by now.'
