Arch-Enemy Event Weapon

The Nox Nyctores are a set of ten weapons.

Information
Unlike Ars Magus, these grimoires were intended to be used as armaments from the very start, and were tempered as a set of weapons to oppose the Black Beast. They are also known as "causality weapons". An advanced tempering technique was needed to forge them, and a total of ten weapons were planned.

The first nine were created during the First War of Magic, based on the Sankishin, to combat the Black Beast. Only those with the highest proficiency in the "Proper Use of Ars Magus" can wield them, and even then, there is a significant risk of mental burden on the user. It's said that the Nox choose their masters. One of the primary functions of Nox Nyctores is to unburden their owners of "needless" emotions and enhance others; this has a profound effect, for example eliminating fear, but owners may also find themselves losing their compassion, remorse, ect.

Among the Nox Nyctores, the Murakumo Unit is unique in that it was produced after the Dark War, and is actually an Anti-Sankishin Core Unit, created in a Cauldron as a means to make contact with the Boundary, where its soul exists. During the Ikaruga Federation's 12th attempt to produce one, together with a Sector Seven research team, the experiment was interrupted by an attack from the NOL's Nox: Highlander: Take-Mikazuchi and this resulted in the creation of Noel, in an incomplete state. Afterwards, three base bodies were stolen from the NOL and Nu was created in Kagutsuchi. Ragna's already destroyed the two others.

No. 01
Owned by the NOL. Its form is that of an attack satellite. The kanji for Highlander is literally "Giant" and is localized as "Gigant". Take-Mikazuchi is a Japanese thunder god and patron saint of warriors. It is commonly mistaken to be The Black Beast itself.
 * Highlander: Take-Mikazuchi

No. 02
Owned by Jin Kisaragi. Its form is that of a Japanese sword. Hyouken is localized as "Mucro Algesco". Yukianesa, "snow woman", is a Japanese fairy.
 * Hyouken: Yukianesa

No. 03
Owned by Noel Vermillion. Its form is that of a pair of handguns. Noel calls them "Demon Guns", localized as "Arcus Diabolus". Bolverk is Odin, disguised in his human form.
 * Majuu: Bolverk

No. 04
Owned by Carl Clover. Its form is that of an automaton. Kishin is localized as "Deus Machina". Nirvana is a transcendent state of enlightenment and tranquility in Buddhism. Ada Clover's body was used in her creation.
 * Kishin: Nirvana

No. 05
Owned by Jubei. Its form is a pair of kodachis, one stored in each end of the sheath. It's apparently named after Musashi from the kendo manga/anime series "Musashi no Ken", although judging from the fact that it's a pair of kodachis, it's likely that it is also named after Musashi Miyamoto, a historical samurai known to fight using two swords in hand.
 * Mujin: Musashi

No. 06
Owned by Hakumen. Its form is that of a nodachi. Ookami means "Howling God" or "wolf" depending on the reading.
 * Zanma: Ookami

No. 07
Owned by Platinum the Trinity. Muchourin means, very roughly, "Untolled Bell".
 * Raigou: Muchourin

No. 08
Owned by Terumi Yuuki. Its form is that of a pair of butterfly knives. Ouroboros is the symbol of a snake eating or biting its own tail.
 * Jasou: Ouroboros

No. 09
Owned by Bang Shishigami.
 * Houyoku: ???

No. 10
Owned by the Nu. Its form is that of a huge sword that can transform into armor; it is actually Nu's true form. Murakumo means "Gathering Clouds", derived from Ame no Murakumo no Tsurugi (Kusanagi-no-Tsurugi), the "Sword of the Gathering Clouds of Heaven".
 * Shinki: Murakumo