Demon's Eye

Demon's Eye (悪魔の眼, Akuma no Me) is a Caster type Eye Magic used by Hades.

Description
This Magic is based on the use of the caster's right eye, which is usually covered by an eye patch. This magic has to be "awakened" in order to activate its yet unknown effects. It's use prompts the caster's hair, beard, mustache and eyebrows to jut out, and releases a vast amount of Magical power around.

Through the use of it, it is claimed to show his opponents the depths of magic which is a realm that even surpasses their imagination. It is also stated to be a way for the caster to reach The One Magic world with Zeref's awakening. According to Rustyrose, all of Hades' Magic Power source, including this magic comes from the Devil's Heart in the Grimoire Heart's battleship. The caster can stop using this magic by just closing his right eye again.