Dimensional Overstride (Romanoff Blitzer)

Dimensional Overstride ( Dimenshonaru Ōbāsutoraido) is a keyword.

Background
Joint Stride Research Committee Findings on Dimensional Overstride and the Earth-Cray Isomorphism

Dimensional Overstride is a phenomenon that allows a "fighter" (an individual on Earth who plays the card game Cardfight!! Vanguard) to directly fuse with their "avatar" (the individual on Cray that they have the strongest connection to through said card game), allowing them to exert their avatar's powers on Earth.

This is only possible under very rare conditions. Firstly, the creatia connections that connect Earth and Cray, which cause events on one planet to influence the other, must be much stronger than normal. Secondly, individuals on Cray must be able to contact their fighter counterparts and be able to possess their bodies temporarily, through a process known Different World Ride; this is usually facilitated with the power of a deity, such as Messiah, and the time-space manipulating powers of members of Gear Chronicle, like the Zodiac Time Beasts. Thirdly, the fighter and their avatar must contact each other through a special process, usually involving certain facilities on Earth and Cray. If a fighter and their avatar have a strong enough bond—that is, a mental connection consisting of positive emotions—then they can call upon their avatar, physically summoning them to Earth and having them enter the fighter's body.

Dimensional Overstride has only been observed once, during the second Gyze war in the origin timeline. Before the war, an individual named Ryuzu Myoujin connected Earth and Cray via a device called the Stride Gate. Due to this, individuals from Cray could Different World Ride their corresponding fighters so that they could visit Earth. A few individuals who had possessed their alternate selves this way carried out a plan to revive Gyze, using the extradimensional afterlife space Void Relics. When Gyze was defeated, Void Relics imploded, necessitating three fighters—Chrono Shindou, Shion Kiba, and Tokoha Anjou—to execute Dimensional Overstride and destroy the core of Relics. They had previous contacted their avatars—the gear dragon child Chrono Dran, the knight Altmile, and the Neo Nectar princess Ahsha—through Gear Chronicle ruins on Earth and Cray.

The power to manifest the power of an individual of Cray on Earth, known as "breaking the isomorphism," is a dangerous one. As unlike Cray, Earth consists of regular humans without psychic powers, magic, or superhuman strength, a Cray individual on Earth can overpower other fighters both physically and in games of Vanguard, giving them a disproportionate advantage over other fighters and thus disproportionately influencing events on Cray. Thus Dimensional Overstride is reserved for emergencies, usually other attempts to break the isomorphism.

Currently, there is no function for Dimensional Overstride to be carried out on Cray i and its corresponding Earth, but facilities for its execution are expected to be completed within a few months. Kairos has commissioned the construction of a Gear Chronicle laboratory in Dark Zone, and has relayed information to Strega Kaiser's fighter counterpart to do the same on Earth.

It should be noted that, in the standard fighter-to-avatar isomorphism, each individual on Cray usually has at most one counterpart on Earth, and vice-versa. (Rarely, some fighters have multiple avatars, and even more rarely, some avatars will have two corresponding fighters.) For example, no matter how many fighters on Earth use Dragonic Overlord in Vanguard, Dragonic Overlord's fate is connected to only one individual, Toshiki Kai. The more favor the demiurge has shown to a fighter, the more likely that fighter has an avatar on Cray that plays a prominent role on Cray. If a fighter wants to draw upon the power of Dimensional Overstride of a Cray individual that they are not the corresponding fighter of, then they must contact the corresponding fighter and ask for their power. (Research is currently being done to rectify this.) Fighters and avatars tend to share similar personality traits and life stories (albeit ones reduced to the scope of Earth rather than all of Cray).

It should also be noted that fighters with avatars are rarely prominent individuals on Earth. They may have gained fame within the domain of ''Cardfight!! Vanguard, but figures important to Earth's geopolitics, like heads of state and military and political leaders, very rarely play Cardfight!! Vanguard''. Investigations by Strega Kaiser's fighter have revealed that they can barely perceive the game's existence, let alone play it, even when it is repeatedly and forcibly presented to them.

The Earth-Cray isomorphism, while secretly known for a long time by Hazur as well as the upper echelons of Cray's governments, has only been recently revealed to the international public due to Hazur's recent awakening and the arrival of the Suppressors. This has stirred controversy within the general public. Some are accepting of the isomorphism, as they like the idea that they have a connection with someone far away. Some believe that the Earth-Cray isomorphism should be halted altogether, as they object to the idea that their lives are controlled by a game. Some see it as an opportunity to exploit, believing that cooperating with the players of Vanguard on Earth could work to their benefit. The members of this research team have their own opinions, of course, but in the interest of impartiality, we shall refrain from printing them in this article.

—Signed, Kairos Wing Dragon, project head and member of Gear Chronicle Temporal Storm, Head of the Murakumo Stride Research and Development Center Argus Cachlyon, Head of the Guardian Force Temporal Mechanics Department