Aika Kain, the Hollow Wytch, is one of the four Great Conquerors of the new age and controls the majority of the Northern World as well as the Kingdom of Fujin. Her empire, the Hollow, enforces her rule across the north and mainly contains Quincys. She is also the Archbishop of Envy.
Reishi Manipulation: Aika uses the Reishi in the atmosphere, and combines it with her Reiryoku to create weapons. They fight using a power from outside. They have an easier time collecting this energy in environments with higher concentrations of Reishi. To a sufficiently powerful Quincy, there is no difference between Reishi and Reiryoku as a source of power. The ability to manipulate such energy allows for a variety of abilities offensive, defensive and supportive.
Spirit Weapon: The weapon that Quincy create by gathering the Reishi in the air.
Blut: A Quincy ability that gives a practitioner inhuman defensive and offensive capability. By making Reishi flow into their blood vessels, Quincy increase their attack and defense power drastically. Though Blut is significantly dangerous, it has one big flaw; the two forms of Blut for attack and defense work using two different Reishi systems, so they cannot be used at the same time.
Heaven's Feel: Cup of Heaven: Heaven's Feel is a magic that allows for the materialization of the soul, which stops the inevitable dispersion of the soul once it no longer has an anchor to the world, and essentially makes it transcend to a higher form of existence. It is a magic that realizes true immortality by making the soul into a high-dimensional planar being capable of interacting with the material world as a mental body without having to return to Akasha. The practitioner will acquire an unlimited source of magical energy due to the soul becoming analogous to a perpetual motion machine.
Cursed Boundary Layer: Makes a cursed shadow expand itself around her and uses it for teleporting herself, repairing physical damage, restraining and consuming others, tentacle attacks and generating her Shadow Giants.
Houjutsu: The other name given to the Thaumaturgical Theory of the Onmyoudou, a variant of the Chinese school of Thaumaturgy that uses the concept of yin and yang as foundation.
Invasion: Invasion allows her to imprison an opponent in an illusion of their fondest memory. The illusion is triggered by conjuring a magical bow and firing an arrow of light into the target. While entrapped in the illusion, enemies are incapable of conducting any movement; rendering them defenseless to incoming attacks.