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PSYqualia (PSYクオリア) is a set of loosely-defined powers which can alter the outcome of a Vanguard fight for the wielder. PSYqualia is a major factor behind the actions of Ultra Rare and Ren Suzugamori's Foo Fighters. In a nutshell, it works by syncing a wielder's cardfight with their unit's actions, which can cause world-changing events on Cray. It is the foil to "true strength," with a major theme of the original series being to rely on one's own power.
The proper spelling for this power is difficult to pin down. The anime has referred to it as "Psyqualia" in Ride 42's title credits, without the odd capitalization, while at the same time referring to Ultra Rare's card shop as "Card Shop PSY." Meanwhile the manga prints the name as ＰＳＹクオリア (Saikuoria), using a capitalized type. Supporting the manga's spelling, Ultra Rare's card shop has its sign printed in full capitals. While the manga was given as an official material, it was not until PSYqualia Strife where the capitalization was finally confirmed.
PowersDepending on the wielder, PPSYqualia is shown to achieve different effects. Ren Suzugamori and Aichi Sendou have both used this to predetermine the outcome of their fights, in Rides 23 and 42 respectively, by imbuing certain cards with the same glow they take on when utilizing the ability. In addition to this, Aichi was able to force a Soul Saver Dragon draw in Ride 22, and reconstruct his deck in Ride 35, visibly using PSYqualia as a catalyst. This power can also make the wielder's opponent feel pain equal to the pain their Vanguard felt, as seen in Aichi's and Ren fight in Rides 63, 64, and 65. When the strength of PSY PSYqualia users is at his pinnacle, they can make their body fill with power when their Vanguard's power goes up.PSYqualia also allows cardfighters to communicate with units, a power described as "talking to your cards."
PSYqualia also has the ability to allow cardfighters to form a special bond with the units in their deck, causing their cardfights to have some impact on events that occur on Planet Cray. This is demonstrated in Aichi's and Ren's cardfight at the end of the Japanese Nationals when Aichi's victory over Ren with Majesty Lord Blaster caused the spirits of the Royal Paladins and Shadow Paladins to accept each other. According to Takuto, cardfighters become "Vanguards" when they use this aspect of PSYqualia.
Cardfighters have been shown to be capable of replicating PSYqualia's powers with their own strength. Even the power to sync with one's units, the signature power of PSYqualia, is achievable through one's own strength. This is demonstrated with Kai and Gaillard, who have synced with Dragonic Overlord and Bluish Flame Liberator, Percival respectively.
While Ren Suzugamori was shown to suffer no ill effects while using his PSYqualia in Rides 23 and 33, Aichi visibly collapsed after overextending his power in both Rides 41 and 42. During a brief flashback to an unknown time before Ride 1, Ren was shown collapsing into Kai's arms, most likely from PSYqualia abuse. Both of these instances show a shift from Ride 23, where Aichi became fatigued by Ren's mere presence. In addition to temporary loss of consciousness, extensive use of PSYqualia was shown to cause Aichi to behave in an abnormal fashion in Rides 41 and 42, as if he himself had become Ren. While PSYqualia apparently ensures the user's victory, Kai refers to it in the same ride as a weakness.
During the first season, PSYqualia is demonstrated as inherently corrupting, with both Ren and Aichi quickly going mad with power when using it, and even after giving it up, when Aichi succumbs to temptation and taps into it again during his match with Ren, he almost instantly reverts to his dark personality. Successive portrayals reflect it in more neutral to positive light.
Several individuals have been confirmed or denied as possessing PSYqualia in different rides. The following is a list of confirmed, suspected and denied users, based on information presented in-series.
First use: Ride 22, used to transform the top card of his deck into Soul Saver Dragon . However, it is also possibly Ride 2. When Aichi states that he can "picture my Blaster Blade defeating you, Kai!" he takes on a glow similar to Ren and Tetsu, and overlaps with his current vanguard--Kai responds to this as he does in later rides.
First use: Ride 64, Takuto used PSYqualia to possess Rekka and talk to Kourin and Suiko. In contrast with other examples of PSYqualia, Takuto's PSYqualia is derived directly from Planet Cray as opposed to some outside force such as a desire to become stronger or The Void Takuto's PSYqualia appears to have evolved beyond the powers available to most cardfighters with PSYqualia. The unique powers of Takuto's PSYqualia include, but are not limited to, modifying people's memories, bestowing PSYqualia upon other cardfighters, and even causing new cards to manifest in a person's deck.
Confirmation of denial: Ride 42, Suiko Tatsunagi states that Misaki does not have PSYqualia, but instead an exceptional memory unique to her.
Confirmation of denial: Although he glowed in the same fashion as Ren in Ride 31, it was shown that he was scared of PSYqualia in Ride 63, so it is unlikely that he has PSYqualia.
PSYqualia was first introduced in Ride 22, when Aichi witnessed a vision of an aurora sphere passing through him. Kai also appeared to notice the light, but dismissed the possibility of Qualia as nonsense. Aichi referred to this as a card 'calling to him.' Aichi proceeded to predetermine a Soul Saver Dragon draw, illustrated as his deck becoming illuminated.
Ride 23 is the second instance of Qualia. In Ren Suzugamori's fight with Kourin, he either foresaw or forced the fight's end, imbuing his Blazers Pleasures with the same light Aichi bore witness to. In ride 35 Aichi was overwhelmed by a dream of his cards arguing over how he should rebuild his deck. Later in the same day, Aichi was able to use Qualia to rebuild his deck without actively considering the outcome, and gained a vision of how to win in his upcoming fights through the use of Soul Saver Dragon. Rides 41 and 42 are the next major instance of PSYqualia. By far the most extreme example, Aichi is completely overtaken by the same persona that Ren assumes in his fights, accurately forecasting his use of Young Pegasus Knight to defeat Kyou, despite having the unit retired, rested out of turn and otherwise prevented from doing so.
In Ride 64, the true meaning of PSYqualia was told. Aichi and Ren, who are known to posses this power, are known as Vanguards. When they both activated their PSYqualia for the first time, they became the Vanguards told of in Cray's legends. Vanguards are the ones who will deal with the chaos on planet Cray and will lead them to the correct path. The true power of PSYqualia involves synchronizing those who posses the ability with planet Cray. In other words, the outcome of the match between Aichi and Ren will synchronize with the result of the battle in planet Cray. Similar situations had happened in the past but each time, the former Vanguards were leaders it lead to disaster. The true function of PSYqualia is to guide planet Cray.
In Season 2, PSYqualia seems erased from everyone's memory, so both existing and new characters react differently towards this newfound power, except for Aichi who still remembers the power and its dangers. Unlike in Season 1 where PSYqualia was mixtures of colors in a person's eye(s), Aichi's PSYqualia appears with only smoke of sky blue color in his eye(s). In Ride 75, Christopher Lo received PSYqualia from Takuto Tatsunagi to challenge Aichi during their battle in Singapore during the VF Circuit. In Ride 90, Leon Soryu is revealed to possess PSYqualia during the finals of the Hong Kong Stage.
When Aichi lost to the reversed Kai, he used PSYqualia to halt the process of being reversed.
In Season 4, Aichi combines his PSYqualia and the power of the Яeverse in the final battle against Kai.
In the Manga and the V-Series
PSYqualia was introduced in the manga before its original anime debut, in Chapter 10: Girl's Fight!! Tetsu and Kai discuss the power at length, where it is described in personal terms as something that Ren has made "complete." Kai insists here that a battle between Qualia is not a "true battle," and makes reference to Ren as being "fake" for using Qualia.
In volume 0, Kouji Ibuki was revealed to have an unknown form of PSYqualia.
In Chapter 24 Kai's closure its revealed that Toshiki Kai has PSYqualia. When he first used it, it was against Aichi in their fight.
It was revealed PSYqualia under the control of Destiny Conductor can turn most Cardfighters into PSYqualia Zombies who is released when the PSYqualia Zombia is defeated or deleted.