Akasha, the Root (根源, Kongen^?), is a metaphysical location within the Nasuverse as the "force" that exists at the top of all theories on dimensions. It is the location of the Akashic Records, the swirl of the Root (根源の渦, Kongen no Uzu^?), which is the source of all events and phenomena in the universe. Existing outside of time, it stores and archives information of all possibilities and events, past, present, and future, of the world. It is the place from where all souls, including those of Heroic Spirits recorded on the Throne of Heroes, originate from and to where they return after death.

In Kara no Kyoukai, "Akashic Records" is a name used to pronounce 「　」 (quoted empty space, equivalent of "   "), which is also referred to as "void" (空, kara^?) that is part of the title, a Japanese word for the Buddhist concept of emptiness, Sunyata. Although, because the Akashic Records is a name, it automatically can't be said to be the same anymore, since 「　」 is just emptiness that can't have a name.

The ultimate goal of the magi is to reach it and many focus their experiments into discovering a path to it, such as the Holy Grail War. As it has no connection to this actual world, the Church, which is only interested in this world, finds it completely meaningless. Souren Araya attempted to do so by tracing the roots of the soul, something that is there but not there, in order to reach a group consciousness. Touko Aozaki studied the human body while aiming to recreate the original human body, under the belief that modern humans could no longer reach Akasha after becoming too diversified genetically. This is a notion supported by the United Language theory, and Gilgamesh's assertions about humanity and Noble Phantasms. Nagato Tohsaka, due to his martial arts background, believed that he could reach Akasha by attaining a state of nothingness and enlightenment.

Magecraft
Concepts
Bounded Field • Conceptual Weapon • Gradation Air • Magic • (Second Magic • Third Magic) • Magical Spells • Marble Phantasm • Mystic Code • Mystic Eyes • Psychic • Reality Marble
Creatures
Demons • Familiar • Homunculus • Humans • Phantasmal Species • Spirits • Vampire
Holy Grail War
Command Spells • Great Grail • Heroic Spirit • Holy Grail • Master • Noble Phantasm • Servant • Servant classes • Servant Parameters
Mage's Association
Barthomeloi Lorelei • Magician • Magus • Sealing Designation
Terms
Akasha • Chants and Incantations • Elements • Gaia • Magic Circuit • Prana • Soul • Thaumaturgical Crest