Nyx's Illusions

Nyx's Illusions also known as Curse of the Dark Hearts is a powerful illusion technique created by Nyx the Greek Goddess of dreams and the personification of Darkness. While this technique is mainly illusion-based, using illusions to manipulate and to trick and confuse opponents, this technique also has other support-type abilities. Although this technique isn't very popular, Nyx has taught a few disciples over the years, one being Shigure, who later taught this technique to Ichiro Pendragon. While not being a power-based technique, this technique is instead support-based, giving the wielder a set of dark support type abilities that focus on trapping or confusing a opponents in order to make them easier to destroy. The different spells are known for being used in combinations to create more powerful effects.

Summary
Nyx used this technique in order to make up for her lack of power compared to other Gods from other factions. Combining her lack of power with her dark magic she created a magic technique that instead would focus on using illusions and support abilities to help subdue stronger foes, being able to use this ability to fight other Gods like Artemis and even God. She taught this technique to many humans and demons, one being Shigure when she was impressed by his power. Nyx, before the start of the series has went missing from her own Greek pantheon.

Shigure after implanting Ichiro with the Lucifer Eye, due to the fact that Ichiro couldn't even access it yet and his power had been severely drained from it and Shigure's earlier experiment he decides to teach Ichiro Nyx's Illusions.

Abilities
Using powerful

Trivia

 * I was originally going to write that Ichiro learned this technique from Freya, however due to it being too dark for her origin and character I changed it to Shigure instead.
 * Name Pending.