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    The four protagonists with approximate projections of their trion levels.

    Trion (トリオン, Torion ?) is a biological power source, or energy, that resides within every living human, and possibly in other life forms as well.[1] This energy provides power for a Trigger's various abilities and functions.[citation needed]

    Description[edit source]

    Trion is produced by an invisible organ, better known as the Trion Gland (トリオン ()(かん), Torion Kikan Lit. Trion Organ ?). It is not known in the human world, but every human possesses this organ, located next to their heart.[citation needed] Every human's trion gland functions differently, like how an individual's strength varies.[citation needed] The trion gland can increase trion production if exerted regularly, much like a muscle[2], and it will likewise benefit from a good diet and rest.[2] After the age of 20, however, it stops developing[3] and starts to decay if not exerted[4], meaning it is best to train Trigger users while they are young.[citation needed] A high trion value can allow an individual to develop one or, in exceptionally rare cases, multiple Side Effects[citation needed], and plays a crucial part in the creation of a Black Trigger.[citation needed]

    The functions of the trion gland are directly connected to a Trigger's power. If the same Trigger is used by a different person, differences will appear concerning their trion values.[5] While using a Trigger, the user will go into a Trion Body, which is their body made fully of trion. Their normal body goes into the Trigger holder.[6] They squirt out gas instead of blood (green and later dark grey gas in the anime). If there is a significant amount of trion loss, the body will revert to their normal body, or in the case of A and B Rank Border personnel, will initiate Bail Out. The regeneration time is proportional to the amount of trion used; the greater the trion expenditure, the longer the regeneration time.[7]

    Aftokrator's Trion Receptors increase both the amount of trion an individual has and its quality as they grow.[8]

    Trion Values[edit source]

    Border quantifies the trion of its personnel and neighbors using a value of 1 or higher, but it is unknown how other countries do it, however Replica has shown the ability to show visualizations of a person's Trion levels.[9] Aspiring combatants with low trion tend to be rejected from Border, though they are still able to work for Border in other roles, such as Operator or Engineer. Border combatants' trion typically ranges from 4 to 9 when using normal triggers, though there are exceptions. For example, Chika Amatori has a trion value of 38, which is the highest known one in Border. On the other hand, Osamu Mikumo only has a trion value of 2, which is the lowest known one among Border's combatants. However, there are operators with a trion value of only 1. Black Triggers provide a significant boost in trion to their users, as shown with Yūichi Jin, who has a trion value of 7 when using normal triggers and a trion value of 37 when using Fujin;[10] This is due to how the trion used to make the black trigger is "crystalized".[11]

    Replica's Visualization of Osamu's trion level

    Differences in trion can manifest in a number of ways. Higher trion allows Shooters to manifest larger trion cubes when preparing to fire and also allows them and Gunners to fire more bullets. It also increases the power, range, and speed of bullets, which is also the case for Snipers, though for them, the parameter increased depends on the specific sniper trigger equipped. The durability of Shield also increases with the user's trion. Furthermore, individuals with high trion can sacrifice themselves to produce a black trigger, as Yūgo Kuga and Sōichi Mogami did.

    Bullet Forms[edit source]

    When Shooters use their gunner trigger it almost always appears in the shape of a cube which can be split. Most Agents choose to split the cube into either 8, 27, or 64 parts, however it has been shown that pyramids[12][13] and Tetrahedra[14][15] are also possible, however it is an advanced technique for people who want to control the number and power of the bullets in detail.[16].

    It should also be noted that Nozomi Kako has a custom Hound[17] which appears as a Sphere which from which smaller sphere are emitted.[18]

    Trion Quality[edit source]

    Trion differs among individuals also due to its quality. How exactly this property affects it is unclear, but it has been suggested that higher-quality trion makes trion manipulation easier, which in turn improves the accuracy of one's control over their Triggers.[19]

    References[edit source]

    1. Daisuke Ashihara: Q: Does trion or trion gland exist in living beings other than humans?
      A: It might, but to use triggers, "clearly radiating the will to activate the trigger" is necessary, so it seems difficult to make a dog or cat use a trigger.
      Source: Border Briefing File, Page 308, Question 176
    2. 2.0 2.1 Daisuke Ashihara: Q: Can the Trion Gland be strengthened with training?
      Does Trion get replenished with time or sleep?
      A: Just like lung capacity and muscle strength, it can be improved somewhat, and does recover with nutrition and rest.
      Source: Volume 5, Question Corner 1
    3. Daisuke Ashihara: Q: Why are all Border agents young?
      A: The biggest reason is that the younger you are, the more your Trion Gland can grow. Agents over age 20 whose growth has stopped often go into administration (like Sawamura).
      Source: Volume 5, Question Corner 1
    4. Daisuke Ashihara: Q: Does the Trion gland decay with age?
      A: It seems it slowly decays if it is not used. Using it maintains it to a certain extent.
      Source: Volume 10, Question Corner 9
    5. World Trigger MangaChapter 37 (p. 16)
    6. World Trigger MangaChapter 8 (p. 9)
    7. Daisuke Ashihara: Q: Are there any differences in the amount of time it takes a person to recreate a Trion Body?
      A: The more Trion a person has (= the more Trion that gets used in battle) the bigger the cost of constructing a Trion Body, so recreating it will take more time. Chika takes a lot of time but Osamu can return to battle fairly quickly (in about 1~2 hours time).
      Source: Volume 13, Question Corner 10
    8. World Trigger MangaChapter 54 (p. 3)
    9. World Trigger MangaChapter 13
    10. World Trigger MangaBorder Briefing File
    11. Daisuke Ashihara: Q: Why does a Trion user's total trion increase when a Black Trigger is activated?
      A: The current theory is that the Black Trigger's creator's own stats override the current user's stats. Sometimes output is even higher than the creator's typical levels, perpahs becuase creating a Black Trigger involves pouring in and condensing every last drop of one's own Trion.
      Source: Volume 25, Question Corner 21
    12. World Trigger Manga and Anime Vol. 13 Chapter 111 (p. 10) and Episode 68.
    13. World Trigger Manga and Anime Vol. 13 Chapter 113 (p. 18) and Episode 69.
    14. World Trigger Manga and Anime Vol. 21 Chapter 185 (p. 10-11) and Episode 96.
    15. World Trigger Manga and Anime Vol. 22 Chapter 192 (p. 18) and Episode 98.
    16. Daisuke Ashihara: Q: Why do Shooter cubes have different shapes like squares and spheres?
      A: Probably because they want to control the number and power of the bullets in detail. It seems to be a very advanced technique to divide the cube into shapes other than more cubes. Izumi could likely do it too, but he isn't so particular about the shape.
      Source: Volume 25, Question Corner 22
    17. World Trigger MangaBorder Briefing File (p. 72)
    18. World Trigger Manga and Anime Vol. 15 Chapter 127 (p. 4) and Episode 75.
    19. World Trigger MangaChapter 162 (p. 15)
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