Helena Grady

Helena Grady (ヘレナ＝グレイディ, Herena = gureidi) is a character and the antagonist in the Hyouken no Majusushi ga Sekai o Suberu.

She is the former instructor of Arnold Academy of Magical Arts until she betrayed her students just to kill them. She is actually a member of the Eugenics. She was defeated and sealed away by Ray White when he frozen her on ice. After her defeat and betrayal, Carol Caroline became the new instructor, replacing Gray.

Magic

 * Fire Magic: Gray has the ability to control fire.
 * Fire Snake: Gray creates two flames that resemble long snakes.
 * Causality Draco: Gray conjures up a massive, purple-colored flame dragon.

Dark Triad System

 * Dark Triad System: The Dark Triad System appears to be an experiment of Professor Gray's. Furthermore, it seems to be comprised of "the sacrifices of many people," as she stated. She injects certain liquid into her body that effectively increases her power. Additionally, she takes on the look of a monster.
 * Mind Infiltration Sorcery

Trivia

 * Gray is responsible for Ray White's identity as the Iceblade Sorcerer to be exposed.