The Legacy Weapons (
They are similar to the Nox Nyctores, and seem to have side effects as the cost of usage.
List of all known Legacy Weapons
Crystal Sealing Blade: Murakumo(契晶封刃・ムラクモ Kesshō Fūjin: Murakumo, Vowed Crystal Sealing Blade: Murakumo) is a blue sword that resembles the blades of Lux Sanctus: Murakumo, only with a longer handle. It's used by Es, and temporary by Tōya Kagari. It can easily destroy a Union's crystal in a single slash. The sword is sentient and has the ability to choose its owner. If it feels it cannot trust someone, no force in the universe will allow that person to wield it. There is no real information about any potential repercussions regarding its use. For some reason, since Es is seen as the Conciliator, the sword is sheathed. The sword can absorb surrounding seithr and store it within this sheath. It's unknown if this sword had this ability before.
Sword of Destruction: Kusanagi(示現崩剣・クサナギ Jigen Hōken: Kusanagi, Demolishing Blade Manifestation: Kusanagi), also known as the God-Killing Sword, is a weapon of Sechs. It requires a level of magical power that few people possess, and generally cannot be used for any extended time. Kusanagi is comprised of four paired red and black swords that resemble the blades of Lux Sanctus: Murakumo, and only Sechs' mastery of gravity-based sorcery allows him to utilize it to its fullest. Can undo any kind of intervention, including the power of god, Phenomenon Intervention. In the hands of someone as powerful as Sechs, it can also manipulate the space/time continuum, allowing small changes to reality to be made. Its price is "Shared Existence", which means that the wielder will be the sum of all timelines, for example, if the user sustains a wound from one timeline, it will be present in another.
Sealed Spear: Izayoi(封印宝槍・イザヨイ Fūin Hōsō: Izayoi, Sealed Treasure Spear: Izayoi) is a spear with two shields hovering around it. It bears eyes on the swords and shields. It is a weapon of Kuon Glamred Stroheim. It allows the user to seal the sorcery of the attacked target, turning any magician into a normal person. When Izayoi is activated, a special barrier is laid and seals the one pierced by the spear inside the barrier. Its price is blindness.
Gallia Sphyra: Outseal(
Mai mentions that she feels enormous power flowing into her when she's holding it. Outseal can quickly heal the wounds of its wielder and teaches them how to use it just by being held. Its user can also summon the spear whenever they need it. In addition, it possesses the power to change direction mid-flight after being thrown in order to home into its target. When Mai unleashes its full power during her Astral Heat, she's able to jump high into the sky and launch Outseal to the ground where it causes a massive explosion upon impact without being damaged itself. Its price, if the replicas have any, is unknown.