Harbinger

Harbingers are dark creatures that predate the Angels and mostly reside in Outer Darkness with the Anti-God essentially making them the evil versions of Angels.

Origin
Harbingers are often referred weeping and gnashing of teeth.

Characteristics
Harbingers are describe to have gnashing teeth and to appear to be weeping. They either have dark grey or dark purple skin colour. The average height of a Harbinger seems to be 7'2" and surpass even the Angels in height. They're known to consume anything that enters their realm and can corrupt even newborns.

Powers and Abilities

 * Possession - Harbingers can possess other creatures such as Humans, Angels, Demons, and even Horsemen.
 * Supernatural Condition - Harbingers have Supernatural Strength, Speed, and Reflexes that surpass even the Supernatural condition of an Angel.
 * Corruption - Harbingers can corrupt almost any mortal or celestial in existence.
 * Grim Darkness Manipulation - Harbingers possess the ability to use Grim Darkness.

Banishment, Protection, and Trapping

 * Heavy Metal Music - Like Demons and Devils; Heavy Metal music make it difficult for Harbingers to think.
 * Krypton - While exposed to the Noble Gas - Krypton - Harbingers are unable to move.
 * Krypton Plasma Bullet - Plasma made from Krypton has the same effect as the gas form of Krypton.
 * Coca & Tobacco - Coca/Tobacco leaves wilt in the presence of a Harbinger, but also makes their eyes glow purple - thus giving away their position.

Harming and Killing

 * Light - Any form of light is harmful to Harbingers.
 * Ripper Weapons - Weapons that have a Ripper's soul bound to them can kill a Harbinger.
 * Angelic Weapons - Weapons used by Angels are capable of harming Harbingers.
 * Anti-God - Anti-God is capable of destroying a Harbinger without effort.
 * Sheol - If a Harbinger gets into a Sheol - they'll be unable to breathe.
 * Descendant of Cain/Abel - A Descendant of Cain or Abel is capable of killing a Harbinger.