Elrose Diomedes

"You think you can beat me, Elrose Diomedes? I, the master of Darkness! I, the Swallowing Void of this World! Doomsday is your day of victory, but until then, facing me, you will never win! The law, by me, dictates so! Nothing is real! Reality is an illusion! And I am the Undefeated King! And so the truth is spoken!"

- Elrose bursting into an egomaniacal monologue against an opponent Elrose Diomedes (エウロス ディオメデス, Eurosu Diomedesu), often nicknamed Rose (ローズ, Rōzu) for short, is the infamous Dark Mage and Guild Master of the Dark Guild Void Eye, serving as her own personal cult, a succession to the previous, unnamed cult she was a part of, where she learned her Black Arts. Following her life into adulthood, Elrose's power and understanding of the Black Arts grew and allowed her to effectively overthrow her cult, killing all the cult members, which jumpstarted her career as a dark mage. Rose eventually grew to become the founder and Guild Master of Void Eye, gathering her own followers, and earning the title of One-Eyed Red Witch (独眼赤魔女, Dokugan Akamajo), her reputation now being built on mastering the Black Arts, including pre-existing ones and creating her own, which lead to her being known as the Black Arm (黒手, Kurote), a side-effect of one of her magics, Godhand.

In present time, Elrose became one of the Dark Saints, an organization of the world's most powerful and dangerous Dark Mages, equivlant to the Magic Council's Ten Wizard Saints, and her reputation that spread throughout the continent and so on, as well as her massive power making her more than fitting to become a member.

Trivia

 * Elrose's personality can essentially be boiled down to "doomsday-wanting saturday cartoon villain".