Delusions are powerful, Vision-like objects produced by the Fatui. Their production method and the number in circulation is unknown, but it appears to utilize the remains of deceased gods and other powerful beings. Like Visions, Delusions grant their wielders the ability to manipulate certain elements, but are supposedly far more powerful than Visions in exchange for draining the user's vitality or backfiring on them.
Knowledge about Delusions is scarce and it is a closely-guarded secret even among the Fatui. According to the Fatui member Viktor, few members beyond the Eleven Fatui Harbingers possess one, and they are personally granted by the Tsaritsa herself. In recent years, Fatui agents have secretly been distributing mass-produced Delusions amongst commoners of the seven nations.
Based on current knowledge, Delusions utilize the remains of ancient gods and other powerful entities; the Delusions produced at Yashiori Island's Delusion Factory used Crystal Marrow, which contains the Tatarigami curse originating from the slain god Orobashi. The powers Collei exhibited in the Manga are the result of a Fatui experiment to directly imbue people with archon residue (Chinese: 魔神残渣 "demon god (ancient god) residue"),[Note 1] which has given her abilities that are extremely similar to a mass-produced Delusion's. During the investigation into the Black Fire incident she caused, Collei's fire was described as having a "great hunger for anything living," and people who touched it were "devoured" and all that remained of them were "charred remains."
Delusions are extremely powerful, but potentially equally dangerous for their user: Crepus Ragnvindr, Diluc's father, was either killed by using one, or left in such agony that Diluc chose to take his life to spare him the suffering. Some members of the Sangonomiya Resistance who used Delusions suffered from rapid aging as a result of their vitality being drained, with some like Teppei dying from its effects.
The side effects of Delusion usage seem to vary from person-to-person. Crepus and Teppei died relatively shortly after taking up the Delusion, while Diluc used Crepus' Delusion for three years without any obvious consequences. The Delusion-users among the Resistance were unequally affected, but there is too little information to draw any conclusion on why that was so.
Neither Childe nor Signora have displayed any drawbacks from using their Delusions. Childe only suffered the repercussions of using the Abyss technique Foul Legacy Transformation, with no explanation as to why the technique is taxing on his body. Unlike most other Delusions, Signora's suppressed rather than amplified her powers; she had previously transformed her body with the art of living flame, and her Cryo Delusion — created with the Tsaritsa's "grace" — prevents it from consuming her.
The Knights of Favonius conducted some research on Delusions following the incident resulting in Crepus' death, although their documents on them were partially destroyed by fire. The little information Jean, Lisa, and Amber could salvage from the tattered documents revealed that Delusions emit the smell of Mist Grass upon use.
In the manga, the Delusion that Crepus and Diluc use takes the form of a red, Vision-like orb fitted onto a glove. It can form barbed chains that sprout from the palm of the glove, allowing them to grapple even large and powerful creatures like Ursa the Drake.
The mass-produced Delusion confiscated by Gorou is a round glass orb with the Fatui insignia inlaid in it, encased in a jagged-edge frame. When Gorou displays it, the orb appears black while the Fatui emblem takes on a light gray color.
Childe's Delusion appears to change forms; Pierro "pinned" it on him when he became a Harbinger, but his Electro Delusion is not seen until the second phase of his boss fight, Enter the Golden House. Upon entering the Delusion Unleashed phase, his Hydro Vision appears to be supplanted by his Electro Delusion — the Vision on his belt turns Electro purple and bears a Fatui symbol instead of the Hydro symbol. His clothing also changes color, although it is unclear whether that is directly related to his Delusion or not. In his Foul Legacy phase, his Vision and Delusion change places again and he is capable of wielding both elements at the same time. The positions of his Vision and the badge along his right shoulder swap places; his Vision, bearing the Hydro symbol once again, can be seen on his shoulder, while the badge — which had no elemental color or symbol up until this point — moves down to his belt and bears the Fatui emblem with Electro purple colors.
The appearance of Signora's Delusion is unconfirmed and she does not wear anything resembling an orb-type Delusion. Based on her animations during the Narukami Island: Tenshukaku fight, the catalyst-like object that floats around her is probably her Delusion. At the start of battle, she uses it to activate the Cryo snowflake-like field under her feet, within which she could create icy blades while surrounded by a barrier. While preparing her transformation, she dispels the barrier and briefly remanifests the catalyst above her head before immediately using it to encase herself in an ice cocoon. After completing her transformation into her Crimson Witch of Embers phase, the catalyst cannot be seen on her, but it returns after she is defeated and she returns to her normal appearance.
- The Eleven Fatui Harbingers
- Fatui Cicin Mages
- Fatui Agents
- Pyro Agent (Pyro)
- Fatui Maidens
- Mirror Maiden (Hydro)
- Crepus (deceased)
- Diluc (formerly)
- Teppei (deceased)
- Other members of the Sangonomiya Resistance (formerly, some are deceased)
Three years before the events of the manga, Crepus, Diluc's father, obtained a Delusion, which he planned on gifting to Diluc on his eighteenth birthday. When the Fatui lured Ursa the Drake to attack them on their way back to the Dawn Winery, Crepus wielded it to save Diluc, but its power backfired and left him in incredible agony. In the manga, Crepus disintegrates and disappears; however, Kaeya's character story says Diluc put Crepus out of his misery by killing him. It is unknown which rendition is the truth.
Diluc ended up taking the Delusion for himself. For reasons not fully known, the Delusion never backfired on Diluc, but it may be because Diluc was a Vision bearer while Crepus was not.
After Diluc's departure from Mondstadt in search of the Delusion's origins, he took the item with him—but not before Kaeya became aware of it. Having abandoned his Vision, he likely used it to fight the Fatui during his three-year journey across Teyvat.
Upon his return to Mondstadt, he uses the Delusion to ambush Krupp during the party at the Dawn Winery. Il Dottore silences Krupp using an unknown weapon, possibly his Delusion. After Il Dottore catches sight of Diluc's Delusion, he grows interested in the "Vision"—either failing to recognize it as a Delusion, or calling it such to throw Diluc off.
Some days later, Diluc, in cahoots with Kaeya, poses as the perpetrator of the Black Fire incident when the Fatui come to apprehend the culprit. Because Collei's black fire from the Fatui's Archon residue research is easily mistaken for a Delusion's power, the Fatui guards accompanying Kaeya fall for the ruse.
Diluc uses his Delusion one last time to hold Barnabas, the Fatui underling who performed the experiments on Collei, in place as Amber delivers the final hit and incapacitate the man. Kaeya and the guards then arrive, seeing Diluc standing over Barnabas. He is "captured" by Kaeya and taken prisoner by the Fatui, but he escapes, leaving his mask and Delusion behind.
When Signora attacks Venti and the Traveler, she creates a blizzard capable of instantly freezing Venti's legs. This is later shown to originate from a Cryo Delusion, given to her to suppress her Pyro abilities as the Crimson Witch of Flames.
During the Golden House battle, Childe uses his Delusion. His Delusion's element is Electro, indicating that Delusions are not bound to its user's Vision element, if they have one.
While investigating claims of accelerated aging among the soldiers of the Sangonomiya Resistance, Gorou manages to seize the "secret weapon" they were using and shows it to the Traveler, who immediately recognizes it as a Delusion. Due to the Sakoku Decree, the Fatui had been making the Delusions in Inazuma by utilizing Crystal Marrow, supplied by the Kanjou Commission. The factory is later raided and razed by the resistance.
- The Chinese name for Delusions, 邪眼 Xié Yǎn, "Evil Eye", is a nod to their name for Visions (Chinese: 神之眼 Shén Zhī Yǎn, "Eye of God").
- Similarly, in English, the term "vision" can be used for both the literal ability to see, as well as the experience of a divine or otherwise supernatural appearance. A "delusion," meanwhile, is a false belief that is propagated even in the face of facts, or the state of being deluded.
- Due to translation adjustments made since the manga's release, the term "archon residue" is now inaccurate. The residue used to empower Collei is derived from gods that precede The Seven's reign.
- Archon Quest Chapter II, Act III, Part 2: Those Who Yearn For the Gods' Gaze
- Commission: Tales of Winter
- Archon Quest Chapter II, Act III, Part 3: Delusion
- Manga, Chapter 7: Dusty Chest (Part 1) pgs. 11-12
- Diluc, Character Story 4
- Kaeya, Vision story
- Artifact Set: Pale Flame, Stainless Bloom description
- Signora's Archive description
- Manga, Chapter 6: Wind and Fyre (Part 1) pg. 13
- Tartaglia, Delusion story
- Archon Quest Chapter II, Act III, Part 7: Duel Before the Throne
- Genshin Impact manga, Chapter 7: Dusty Chest (Part 2), page 7
- Genshin Impact manga, Chapter 1: Bad Wine (Part 2), page 10
- Genshin Impact manga, Chapter 16