You’ve probably seen black goo in entertainment for the last few years. After researching it for a while it’s my opinion that the Black Goo represents graphine nanotechnology
This is tied into Nanotech, 5G, The Internet of Bodies and AI. Of which some of the patents are listed here.
Culmination in my hypothesis AI is to summon the demon(as Elon Musk said), that will then form a false aethyr through the Internet of Bodies and 5G as visualized here:
However in the Kpop Aespa(Aethyr?) universe the god they attempt to rebirth is Naevis, a female goddess. Which then led me to Sumerian Egyptian symbology: