In the Apocalypse texts, the sacred sword is the sword used to launch chastisements on human beings. It symbolizes the will of God.
In Shinto’s texts, the sacred sword is a goshintai. A goshintai is a sacred and hidden object. Goshintai are placed and venerated in Shinto’s Shrine because the goshintai becomes an incarnation of the Shrine’s god during rituals. Goshintai are terrestrial bodies of substitution for Japanese gods.
In the X/1999, the sacred sword is the sword used to launch chastisements on human beings. THis sword is hidden inside Togakushi Shrine.