Number iC1000: Numerounius Numerounia
Fiend / Xyz / Effect
LIGHT / 
135 Level 13 monsters
If this card is Special Summoned by the effect of "Number C1000: Numerounius", it gains 100,000 ATK/DEF during your opponent's turn only, also apply the following effects from the start of the next turn after this card was Special Summoned.
● Monsters your opponent controls must attack this card, if able.
● At the end of your opponent's turn, if this card did not battle, you win the Duel.
When an opponent's monster declares an attack: You can detach 1 material from this card; negate the attack, and if you do, gain LP equal to that monster's ATK.
?/?
CARD ID: 15862758
STATUS TCG: Unlimited
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This monster is the evolved form of Number C1000: Numerounius.
The presence of the word imaginary between Chaos and Number in this card's name makes it not a member of the Number C archetype, giving it a few unique quirks:
It is the only C monster to be neither a CXyz nor a Number C monster.
It is the only monster that is a Number monster and a C monster, yet is not a Number C monster.
The lowercase i standing for imaginary in this Number's name may be a reference to the mathematical symbol for the imaginary unit, a number whose value is defined as the principal square root of -1. The set of imaginary numbers is disjoint from the set of real numbers.
In addition, the term imaginary may be interpreted as its usual meaning of fictitious or existing only in the mind, referencing the word Delusion in this card's Japanese name and the fact that this monster's stats and effects are so overpowering as to literally seem delusional or dreamed-up.
On a side note, this is also the only instance in a card name where a full word has been abbreviated to a single lowercase letter.
This is the first Rank 13 Xyz Monster to be released to the OCG/TCG, as well as the first Rank 13 Number monster.
It is the second Rank 13 monster overall, with the first being New Order 13: Etheric Amon, the strongest monster of the Astral World. This card can be considered the strongest monster of the Barian World and the shape of its lower body resembles a dark version of Amon.
This card can be compared to Vennominaga the Deity of Poisonous Snakes:
Both are the stronger of two ace monsters for a certain archetype (Numeron and Venom), while not actually belonging to that archetype due to a slight alteration in the (Japanese) card name.
Both require the weaker ace monster to be destroyed in order to be Summoned, and both have an automatic victory condition.
This is the first card that refers to an ATK value with 6 digits (100,000 ATK).
The presence of the word imaginary between Chaos and Number in this card's name makes it not a member of the Number C archetype, giving it a few unique quirks:
It is the only C monster to be neither a CXyz nor a Number C monster.
It is the only monster that is a Number monster and a C monster, yet is not a Number C monster.
The lowercase i standing for imaginary in this Number's name may be a reference to the mathematical symbol for the imaginary unit, a number whose value is defined as the principal square root of -1. The set of imaginary numbers is disjoint from the set of real numbers.
In addition, the term imaginary may be interpreted as its usual meaning of fictitious or existing only in the mind, referencing the word Delusion in this card's Japanese name and the fact that this monster's stats and effects are so overpowering as to literally seem delusional or dreamed-up.
On a side note, this is also the only instance in a card name where a full word has been abbreviated to a single lowercase letter.
This is the first Rank 13 Xyz Monster to be released to the OCG/TCG, as well as the first Rank 13 Number monster.
It is the second Rank 13 monster overall, with the first being New Order 13: Etheric Amon, the strongest monster of the Astral World. This card can be considered the strongest monster of the Barian World and the shape of its lower body resembles a dark version of Amon.
This card can be compared to Vennominaga the Deity of Poisonous Snakes:
Both are the stronger of two ace monsters for a certain archetype (Numeron and Venom), while not actually belonging to that archetype due to a slight alteration in the (Japanese) card name.
Both require the weaker ace monster to be destroyed in order to be Summoned, and both have an automatic victory condition.
This is the first card that refers to an ATK value with 6 digits (100,000 ATK).