Belphegor

Belphegor is a demon who worked as a torturer in Hell and becomes an ally of the Winchesters after God begins the end of the world.

Powers and Abilities
Kipling was a moderately powerful black-eyed demon.
 * Demonic Possession - As a demon, he requires a vessel to walk the Earth.
 * Immortality - As a demon, he was immortal unless killed. Belphegor mentioned that when he was human, people were worshipping a rock though it is unclear how long he has been a demon.
 * Invulnerability - As a demon, he is invulnerable to all forms of conventional harm.
 * Spell Casting - Belphegor displays an impressive knowledge of magic, being able to cast spells to cast souls out of the bodies they are possessing and to set up a barrier to trap ghosts.

Weaknesses
Kipling presumably possesses all of the regular weaknesses of a demon.
 * Seraphim - Belphegor appeared to be wary of Castiel when threatened by him.
 * Angel Blades - As a regular demon, he could be killed with an angel blade and was wary of one when Castiel threatened him.

Appearances

 * Season 15
 * Back and to the Future