User blog comment:Rafe Adler/"Byzantium" Discussion/@comment-1031724-20181208201610/@comment-74.132.82.188-20181210001452

Lucifer could have awoken as a skeleton because his vessel (Nick) was still alive on Earth.

But I did consider that maybe the red eyed thing was the Cosmic Entity, but I still think it was Lucifer. There is nothng from Season 13 to indicate the Cosmic Entity had red eyes, nor did it rise in skeletal form; it rose in hominid form if I remember correctly.