Diabolus

Diabolus is the oldest archdemon as well as the first creation of Satan.

Birth
Diabolus is the first creation of Satan and the first archdemon, he was created by Satan to free Chaos.

The Liberation of Satan
Diabolus manage to free the Elder Darkness and, so, Satan, he, currently, helps them to free Chaos.

Personnality
Diabolus is rude and strict, he loves his father deeply and idolizes him, as the first Archdemon, he is proud, he can be extremelly crual.

However, he is not without qualms or remorses and, like Lucifer, will hesitate to kill innocents.

He always keep his promises and try to pay his debts the best he can.

Powers

 *  Middle-Tier Nigh-Omnipotence  : Diabolus is the first Archdemon and is the most powerfull of the demons, is only equaled by his fellow Archdemons and surpassed by the Primordial Entities.
 * Demon Physiology : Diabolus is an Demon because he is the first one.
 * Archdemon Physiology : Diabolus is the first Archdemon.
 * Super Strength : Diabolus is almost unsurpassed in raw power, he is, in fact, only equaled by the other Archdemons and exceeded by the Primordial Entities.
 * Smiting : Diabolus has the power to kill demons and even angels by touching them, a glowing light will make glow the touched and he will die.
 * Super Speed : He can move very fast.
 * Super Stamina : He needn't breath, drink or eat
 * Immortality : He can live for an infinite amount of years.
 * Immunity : He is immune to diseases, to Demon Blades, to all bladed-weapons, to the All-Killing Knife and to Demon Swords.
 * Magic : He can use black magic, at preparation for apocalypse, he even learn white magic.

Beings

 *  Primordial Entities  : The First Beings can kill him.
 *  Archangel-Level Beings  : He is equaled by them and two Archangel-Level Beings working together can kill him easily.

Weapons

 *  Primordial Weapons  : The First Weapons can kill him.
 *  Archangelic Weapons  : Archangels' weapons can kill Diabolus.