The Nox Nyctores Causality Weapons(事象兵器アークエネミーJishō Heiki Ākuenemī, Archenemy Phenomenon Weapons), also known simply as Nox Nyctores(事象兵器(アークエネミー)Ākuenemī, Phenomenon Weapons) and the Causality Weapons(事象兵器Jishō Heiki, Phenomenon Weapons), are a set of eleven weapons, and the final stage of Ars Armagus. These Armagus were tempered as a set of close range and melee-type weapons to directly oppose the Black Beast. An advanced tempering technique was needed to forge them, and a total of ten weapons were planned.