There was no harm caused, so it shouldn't be radioactive energy.
If this kind of energy truly is a signal, then what sort of existence would be receiving this signal?
No, that's not right!
Science Supreme shook his head and said, "This shouldn't be a transmission of a signal, but rather an energy connection!"
With that, he picked up a pen and paper and began to draw, while also explaining his hypothesis to those around him.
"Let's assume there's a mysterious existence, um... let's just call it Boss. The relationship between this Boss and the Nightmare should be that of parent and child, with the Nightmare originating from the Boss and also relying on the Boss's energy to survive."
Science Supreme pointed at the drawing and said, "This line represents the path of energy transfer, which is the energy fluctuation we just observed. So in reality, the Nightmare is surviving on the energy transmitted by the Boss. More precisely, the Nightmare Core comes from that Boss!"
