Number C

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"Number C", short for "Chaos Number" (Ｃ (カオス) Ｎｏ． (ナンバーズ) Kaosu Nanbāzu), is a sub-archetype to both the "C" and "Number" archetypes. They are evolved forms of the base "Number", which are Summoned by overlaying their base counterpart through Chaos Xyz Evolution. They are used by Yuma Tsukumo, Reginald Kastle/Nash, Mizar, Girag, Alito, Vector, Number 96, Quattro, Rio Kastle/Marin, Dumon, Trey, Quinton and Don Thousand in the Yu-Gi-Oh! ZEXAL anime and Yu-Gi-Oh! D Team ZEXAL manga. They are supported by the "Rank-Up-Magic" archetype and "Chaos Field".

So far, all "Chaos Number" monsters, if they are Summoned normally rather than by Chaos Xyz Evolution, require one more material than their normal versions. The first two "Chaos Numbes" require the same Attribute as the Attribute of thier base form and neccisatate the user having 1000 or fewer Life Points in order to activate their effects. The rest require a "Rank-Up-Magic" Spell Card, or in rare cases, another card capable of performing a Rank-Up such as "Don Thousand's Throne".

Story

A "Number C" symbol.

When "Number" holders have a high level of a certain emotion, "Chaos Numbers" start to appear. For example, Astral and Yuma Tsukumo obtained "Number C39: Utopia Ray" when Astral was happy to know Yuma considered him a friend. Reginald Kastle obtained "Number C32: Shark Drake Veiss" when his desire for revenge, brought on by "Number 32: Shark Drake", overpowered him. Later, Yuma obtained "Number C39: Utopia Ray V" after Vector (as "Ray Shadows") gave Yuma "Rank-Up-Magic Limited Barian's Force" and their "friendship" was strengthened as a result, though this was used by Vector to get closer to Yuma. Later still, Yuma and Astral obtained "Number C39: Utopia Ray Victory" when their friendship was strengthened as a result of Yuma rescuing Astral from his own darkness.

When Summoned without the use of a "Rank-Up-Magic" card, they have the same ATK and DEF as their non-Chaos counterparts. When one is Summoned, the "Number" reverts to its neutral form and enters the Overlay Network. The Overlay Network then explodes, revealing the new neutral form, which then unfolds into the Chaos Number.

The sealed Barian Gate from which the "Number C" monsters are Summoned through Rank-Up.

In Yu-Gi-Oh! ZEXAL II, Barians Summon "Chaos Numbers" through the use of "Rank-Up-Magic" cards. As implied, the "Chaos Number" Summoned this way is 1 Rank greater than its original form. Also, unlike their non-Barian counterparts, these "Chaos Numbers" have increased ATK and DEF. "Chaos Numbers" Summoned this way have a blood-red aura surrounding them, slightly resembling electricity. When someone Summons a "Chaos Number" by Ranking-Up, they enter a contract with it in order to maintain control of it, at the risk of depleting their life, such as with Girag when he Summoned his "Number C106: Giant Red Hand". It can also put the user at risk in case the "Chaos Number" is destroyed, which can leave them severely injured, even to the brink of death. If a "Chaos Number" monster is Summoned via a "Rank-Up-Magic" card (except "Numeron Force", "Astral Force" and "Argent Chaos Force"), "Chaos Field" or "Don Thousand's Throne", their Overlay Units take the form of red diamond-shaped crystals as opposed to glowing orbs, and are referred to as "Chaos Overlay Units", just as with the "CXyz" monsters. The sealed "Barian Gate" appears while doing so.

"Number C" monsters have powerful effects, though this is balanced out by their requirements - needing 1000 or less Life Points for the "Number C" monsters that have the same Rank as their "Number" counterparts, or requiring specific monsters to be attached to them as Overlay Units (or in the Graveyard in the case of Number C101 and Number C103) for Ranked-Up "Number C" monsters.

Chaos Numbers

So far, 18 "Number C" are known to exist, as well as an additional seven which are "Number C10X".

Symbol	Monster	Neutral form	Owner(s)	Base Number	Number location
	Numeron Chaos Gate Shunya	None	Don Thousand (Originally) Nash Yuma Tsukumo Astral	Numeron Gate Ekam	Right Horn
	Chaos Chimera Dragon	None	Vector (Originally) Don Thousand Nash Yuma Tsukumo Astral	Doom Chimera Dragon	Right wing
	Chronomaly Chaos Atlandis		Trey (Originally) Mizar Don Thousand Nash Yuma Tsukumo Astral	Chronomaly Atlandis	Chest ring
	Chaos Dyson Sphere	None	Quinton (Originally) Mizar Don Thousand Nash Yuma Tsukumo Astral	Dyson Sphere	Two panels in the center sphere
	Gimmick Puppet Giant Hunter		Quattro (Originally) Nash Yuma Tsukumo Astral	Gimmick Puppet Giant Grinder	Center of forehead
	Shark Drake Veiss	File:NumberC39SharkDrakeVeiss-JP-Anime-ZX-Sealed.png	Reginald Kastle/Nash (Originally) Yuma Tsukumo Astral	Shark Drake	Left side of chest
	Utopia Ray		Yuma Tsukumo Astral	Utopia	Joint plate on left wing
	Utopia Ray V		Yuma Tsukumo (originally) Astral	Utopia	Left shoulder
	Utopia Ray Victory	None	Yuma Tsukumo (originally) Astral	Utopia	Left shoulder plate
	Gimmick Puppet of Dark Strings	None	Quattro (Originally) Nash Yuma Tsukumo Astral	Gimmick Puppet of Strings	Left wing
	High Manipulator of Chaos	None	Vector (Originally) Don Thousand Nash Yuma Tsukumo Astral	Manipulator of Souls	Right side of waist
	King Overfiend		Number 96 (Originally) Vector Don Thousand Nash Yuma Tsukumo Astral	Djinn Buster	Right side of waist
	Heraldry Crest of Horror	None	Number 96 (Originally) Vector Don Thousand Nash Yuma Tsukumo Astral	Heraldry Crest	Left horn
	Abyss Supra Splash	None	Nasch (Originally) Yuma Tsukumo Astral	Abyss Splash	Middle panel of armour
	Requiem in Berserk		Alito (Originally) Vector Don Thousand Nash Yuma Tsukumo Astral	Rhapsody in Berserk	Right shoulder plate
	Gimmick Puppet Disaster Leo	None	Quattro (Originally) Nash Yuma Tsukumo Astral	Gimmick Puppet of Leo	Top of right foreleg
	Heart-eartH Chaos Dragon	None	Number 96 (Originally) Vector Don Thousand Nash Yuma Tsukumo Astral	Heart-eartH Dragon	Right side of abdomen
	Dark Storm		Number 96 (Originally) Vector Don Thousand Nash Yuma Tsukumo Astral	Dark Mist	Right horn on midsection
	Numerronius	Unknown	Don Thousand (Originally) Nash	None	Right thigh

Chaos imaginary Numbers

While "Chaos Numbers" are generally Summoned by performing Chaos Xyz Evolution on a 'regular' (non-Chaos) "Number", there was a single instance where Don Thousand performed a form of Chaos Xyz Evolution on a monster that was already a "Chaos Number", creating what he called a "Chaos imaginary Number", referencing the mathematical concept of imaginary numbers. Technically, due to this card's name, it is not a true member of the "Number C" archetype.

Symbol	Monster	Neutral form	Owner(s)	Base Number	Number location
	Numerronius Numerronia	None	Don Thousand (Originally) Nash	Numerronius	Right side of the head

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