User blog comment:Rafe Adler/"Stuck in the Middle (With You)" Discussion/@comment-1031724-20170217183659/@comment-26982641-20170217192931

It is a complex one.

As for species it may be: God (Light), Darkness (Dark obviously), Angels (Archangels at least), Leviathans, and Bearer of Mark of Cain since Knights really aren't strong and invulnerable.

For individuals: Michael, Lucifer, Gabriel, Raphael and Bearer of Mark of Cain. (As Empyrean said God, Death, Darkness are outside of creation, which also indicates Archangels tho)

I just hope that they'll make it sensible.