Brain

"Interesting." Lucifer said as he looked at the brain with curiosity in his eyes.

Well, it is the truth that this scene was interesting for Lucifer.

It was the first time that he saw something like this. A brain surrounded by a glass that was filled with water.

What's more, this brain had consciousness and it was even moving on its own.

This is entirely different compared to the monsters who only have a single organ in their body.

Those monsters still have a body that they use to move around with.

However, this brain was...its brain was all it had. Its brain was its body.

Although that's how demons and angels technically are, it is still a different case.

This is still a different case even when compared to the monsters who only have a single organ in their body.

The brain was its body...and it was even using its own brain to move or anything of the sort.