User:Trey Arclight/A Certain Scientific Card Game

Numbers
In the Duel Monsters AU of A Certain Magical Index, Numbers are special Xyz Monsters generated through unexpected distortions caused by espers' AIM Diffusion Fields.

Espers unconsciously create cards through their AIM fields. However, most of the monsters that they create stay within a certain, predictable Summoning energy range given their Level and projected capabilities. "Number" cards, on the other hand, have a Summoning energy that greatly exceeds their other monsters'. It is not entirely understood why espers sometimes create these cards, and why they all fall under the same archetype of "Numbers"; to this end, the "Numbers" are heavily researched by Academy City's elite, with a few unscrupulous individuals even seeking to use this data in hopes of replicating this power for themselves.

Higher-leveled Espers tend to have a greater chance of creating "Numbers." Those who fall into the trap of using the Level Upper may find themselves in possession of a "Number" due to the massive changes that the program causes to their brain functions, which disappears after the effects of the Level Upper wear off. Those "Numbers" strangely then become exclusive to that person; if they can increase their Esper level organically, they may be able to regain that "Number."