Legacy Weapon

The Legacy Weapons (発掘兵装, Regashi Wepon, lit. Excavated Armaments) are weapons with special properties.

Information
They are similar to the Nox Nyctores, and seem to have side effects as the cost of usage.

Vow Crystal Seal Blade: Murakumo
Vow Crystal Seal Blade: Murakumo - A blue sword that resemble the blades of Lux Sanctus: Murakumo with a longer handle. It can easily destroy the Union crystal. The price of usage is unknown.

Manifestation Demolition Blade: Kusanagi
Manifestation Demolition Blade: Kusanagi - Also known as the God-Killing Sword. Four red and black swords that resemble the blades of Lux Sanctus: Murakumo. Its price is "Shared Existance".

Sealed Treasure Spear: Izayoi
Sealed Treasure Spear: Izayoi - A spear with two shields hovering around it. It bears eyes on the swords and shields. Its price is blindness, a side effect shared with the Sealed Weapon Izayoi.