Orangutan

Lucifer watched the other newcomers kill the people who were lying on the ground.

The ones who were lying on the ground were mercilessly killed by the newcomers since this was something that they must do in order to prove their worth.

However, the ones who were lying on the ground never screamed for help and they just acted as if they already accepted their deaths.

Well, that was only normal. After all, the mental fortitude of these people was already broken and they can no longer function as living creatures.

They...are just dolls with a washed-up soul living in it.

And that was because of the continuous tortures that have been done to them over the course of years and years.

Right, these people have been tortured for years and there was nothing they can do about it.