What is this?

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Essential Raid Arc:

Chapter 76

slowly, and without sound, Lucifer lost his voice and story,

everything became absolute darkness with only a few whispers in the top of his head.

Lucifer says in his mind: Do I remember that, like I was here once, Lynx? Lynx !!? are you still here? you hear me? I don't even see you, it's just black what the hell! there was a strong smell of blood, the red fog was visible in front of him and it was as if his head was moving slowly backwards. all they talked about so far was just an illusion of the power of Jin, the cube of darkness, that he had done in the past, they talked alone and he even thought he had unlocked the old power of his ancestors.

but they were actually in a trance on 2 spikes and talking with their mouths open, without moving their lips, blood and other parts of their bodies falling while Lynx and Lucifer realized that none of this happened.