Anyways to answer the OP, Idk all that seems boring, just go with what KKK and Dies Irae had.
Something like:
shown to exist outside of the world's laws and concepts and do not obey them. They are described as both dead and alive, but yet also described as life beyond death, they exist within and embody a world that is described as unchanging and everlasting, existing and yet not existing, outside the boundaries of providence, they are walking contradictions, they represent a dichotomy, yet they don't as well.
Now I leave this cursed thread.