Venuzdonoa

"This is Venuzdonoa, the Abolisher of Reason—the demon sword of the founder, destroyer of anything in existence. Be it providence, fate, or a miracle, all will bow down before me and disappear."

- Anos to Ivis Necron in "Demon King"

Venuzdonoa, the Abolisher of Reason (理滅剣ヴェヌズドノア), is the demon sword of Anos Voldigoad which can destroy all things in creation, including the laws and principles which make up the world.

Overview
Venuzdonoa is a demon sword created by Anos Voldigoad that is capable of destroying all reason. When the sword is summoned, innumerable particles of black light gather to form a shadow of a sword. Once the wielder grasps the hilt of the sword, the shadow inverts and reveals a longsword the color of darkness. Anos uses Demon Castle Delsgade, which serves as a giant three-dimensional magic circle, to summon Venuzdonoa.

In truth, Venuzdonoa is not really a sword but a magic spell. After battling the Goddess of Destruction Abernyu, Anos seized her power and transformed it into Venuzdonoa.

Great Spirit Arc
After the war between demons and humans was averted, Nousgalia appeared and sought to eliminate Anos and revive Abernyu with the help of the "Child of God". This mysterious figure was eventually revealed to be Misa Iliorogue, who was also the spirit that embodied the legends of the fake Demon King, Avos Dilhevia. Due to her rumors and lore, Avos was able to claim ownership over Delsgade in order to take control of Venuzdonoa.

{{SpoilerSection|id=2| She attempted to defeat Anos with Venuzdonoa but failed after Anos used his Dark Purple Magic Eyes to nullify the sword's power. Afterwards, she frees  to fulfill Nousgalia's mission to restore the order of destruction, but it destroys her instead. After her defeat, Anos saves Misa and regains control of Delsgade and Venuzdonoa.

Dragon God's Country Giordal Arc
During a field trip to Gairadite, Anos met Arcana and Ahid Alobo Agatse, and learned of the Underground World and its current conflicts. During that time, Anos helped Arcana, whose authority was incomplete, by temporarily lending her Venuzdonoa so she could combine it with the Moon of Creation  to create the Sword of the Almighty Livaingirma.

Demon King's Father Arc
Anos later learned that Militia kept his lost memories in artifacts called the Creation Stars Erial. Anos and his group set out to find them. He learned that his real father, Celis Voldigoad, was killed by Graham. Anos fought Graham and destroyed him with Egil Grone Angdroa, but Graham revealed that his true form was nothingness. Anos summoned Delsgade to use Venuzdonoa, but it was incapable of permanently destroying Graham. While Graham's weapon, Befenguzdogma and Venuzdonoa seemed evenly matched, Befenguzdogma was able to destroy Venuzdonoa.

Disaster Abyss World Arc
In a challenge against Kostoria Arzenon, Anos let Kostoria summon Venuzdonoa. Because Sasha regained her power as the Goddess of Destruction by merging together with Delsgade, her body and her sight became the domain of Delsgade, so she must be present in order to summon Venuzdonoa. She can manifest the sword in her sight via her Magic Eyes of Reason Destruction. Despite Kostoria Arzenon correctly summoning Venuzdonoa, she did not win because of Venuzdonoa destroying reason, and Anos won the challenge.

Later, in a duel between Sasha and Kostoria, Sasha used Venuzdonoa herself, but Kostoria copied Venuzdonoa via her Magic Eyes of Transcription. Both failed to destroy each other, and Sasha's magic power ran out preventing both of them from continuing to use the sword. }}

Abilities

 * Absolute Destruction: No matter how tough, eternal, or infinite something is, Venuzdonoa can destroy it. Venuzdonoa can destroy all matter, nullify magic spells, and erase people's sources. It can negate the immortality of gods and prevent any regeneration. Venuzdonoa is capable of doing illogical feats by temporarily destroying the laws and principles which make up the world.

Feats
Venuzdonoa destroyed the reason that...
 * rewinding time before an attack would revert your body to an unharmed state, therefore allowing Anos to stop Ivis Necron from "regenerating".
 * dodging an attack meant you avoided the attack, therefore allowing Anos to hit Melheis despite Melheis dodging Anos' attack.
 * not cutting things meant they would not be cut, therefore allowing Anos to cut all of Melheis' thousands of decoy magic gates all at once without cutting them.
 * a person's attacks would hit the intended target, therefore making Jerga's own attacks hit himself instead.
 * Evansmana could not harm things which are holy,by turning Jerga into a non-holy entity therefore allowing Lay to harm Jerga's magical body with Evansmana.

Weaknesses
Venuzdonoa can only be used near Delsgade, although magical things such as dimensions are irrelevant as long as the wielder is physically near the castle. A workaround for this condition is summoning the castle with origin magic. While Venuzdonoa itself does not have a time limit, summoning Delsgade consumes an immense amount of magic power, restricting how long Venuzdonoa can be used. Furthermore, Delsgade takes some time to summon. Venuzdonoa can still be used without the wielder holding it in their hands, but it is weaker as a result. It can only show its true value when held.