Demonic Transformation is a rare and powerful ability.
The first beings to become demons were the Gods/Angels who rebelled against Heaven. In the battle that ensued, the rebels were defeated and cast into the fires of Hell, from which they were reborn as demons.
Azazel was able to turn Amon into a demon as part of a deal Amon made with him. Their agreement involved Amon betraying Barossa Leone and allowing Azazel to kill Barossa and his companions. The process which Amon became a demon is never shown.
Half-demons possess the ability transform into a demon at will. The gods refer to this as a forbidden power and publicly shun hybrids for it. The only known demon hybrid was Amira, an artificially created half-angel/half-demon.
Martinet was infamous for creating a concoction that could turn regular humans into demons. These demons were loyal to Martinet's cause and lacked their original kind hearts, disregarding former friends and allies upon transformation.
- It is never explained why Jeanne and Amira's appearances changed completely upon transformation yet only Favaro's eyes changed when Favaro transformed.
|Objects||Alessand's dagger • Amira's compass • Amira's pendant • Bahamut's Talon • Barossa's dagger • Black Bible • Bounty Hunter's Bracer • Charioce XVII's bracelet • Demon Key • Dromos • El's ocarina • El's toy • Favaro's crossbow • God Key • Golem • Green Stone • Hoverboard • Maltet • Marginal Golem • Martinet's concoction • Nina's whip • Précieuse • Rita's antidotes • Rita's staff • Smoke Bomb • Transcendence Key|