Genshin Impact Wiki
Genshin Impact Wiki

A secret tome that belonged to the scholars of the Knights of Favonius. It describes the logic and power of elements and matter.

Favonius Codex is a 4-Star catalyst.

Ascensions and Stats

Level Base
2nd Stat
(Energy Recharge)
0✦ 1/20 42 10.0%
20/20 109 17.7%
Ascension Cost (0 → 1)
Item Mora.png 5,000 Mora
1✦ 20/40 135 17.7%
40/40 205 25.8%
Ascension Cost (1 → 2)
Item Mora.png 15,000 Mora
2✦ 40/50 231 25.8%
50/50 266 29.8%
Ascension Cost (2 → 3)
Item Mora.png 20,000 Mora
3✦ 50/60 292 29.8%
60/60 327 33.8%
Ascension Cost (3 → 4)
Item Mora.png 30,000 Mora
4✦ 60/70 353 33.8%
70/70 388 37.9%
Ascension Cost (4 → 5)
Item Mora.png 35,000 Mora
5✦ 70/80 414 37.9%
80/80 449 41.9%
Ascension Cost (5 → 6)
Item Mora.png 45,000 Mora
6✦ 80/90 475 41.9%
90/90 510 45.9%

Total Cost (0 → 6)

Item Mora.png 150,000 Mora


  • Windfall has a chance to activate for each hit that deals damage to an enemy as well as for each enemy hit while the character is on the field. Therefore:
    • Multi-hit skills such as Diona's Icy Paws (5 hits) are more likely to activate the passive.
    • Skills that deal AoE damage such as Venti's Skyward Sonnet are more likely to activate the passive if the skill hits multiple enemies.
    • If the character equipped with the weapon is not on the field when they deal critical damage, the passive will not activate.
    • If the enemy is Immune to the damage dealt, then the passive will not activate.
  • In Co-Op Mode, triggering Windfall generates elemental particles for all members of the team.


A secret tome that belonged to the scholars of the Knights of Favonius. It holds the collective knowledge of the scholars.
It is inlaid with crystallized elements, which is what makes the Favonius Codex such a rarity.
Not only because the elemental crystals are precious, but also because each Favonius Codex is hand-made.
Only scholars who have mastered the control of the elements can create such elemental crystals.[Note 1]

When the Knights of Favonius was founded, the Dawn Knight Ragnvindr turned the aristocrats' indoor baths into a library.
In time, countless contributions from bards, scholars and travelers turned the library into the largest collection of literature in the northern half of the continent.
After all, songs are whisked away by the wind and wine's pleasure lasts but a fleeting moment. Only that which is committed to the page may sparkle and shine for eternity.

Even so, the scale of the library's collection is now a fraction of what it was at its peak.[Note 2]
For sadly, the library once burned down in the "Great Fire of Fall Equinox" tragedy.

There is a large sturdy door made of poplar wood in the library basement.
It is said the door predates the founding of the library and stood firm against the smoke and flames.
The truth is this door stood there long before the Knights of Favonius was ever founded.
The Knights of Favonius officially states that the restricted section of the library is housed behind the door.
But tales tell of a far more profound secret hidden within.




Event Wishes

Favonius Codex was promoted or featured with a drop-rate boost in 6 Event Wishes:

Wish Featured Duration
Epitome Invocation 2020-12-01.png
Epitome Invocation 2020-12-01
Weapon Favonius Codex.png Favonius Codex
December 1, 2020 – December 22, 2020
Epitome Invocation 2021-04-06.png
Epitome Invocation 2021-04-06
Weapon Favonius Codex.png Favonius Codex
April 6, 2021 – April 27, 2021
Epitome Invocation 2021-07-21.png
Epitome Invocation 2021-07-21
Weapon Favonius Codex.png Favonius Codex
July 21, 2021 – August 10, 2021
Epitome Invocation 2021-09-21.png
Epitome Invocation 2021-09-21
Weapon Favonius Codex.png Favonius Codex
September 21, 2021 – October 12, 2021
Epitome Invocation 2022-01-25.png
Epitome Invocation 2022-01-25
Weapon Favonius Codex.png Favonius Codex
January 25, 2022 – February 15, 2022
Epitome Invocation 2022-04-19.png
Epitome Invocation 2022-04-19
Weapon Favonius Codex.png Favonius Codex
April 19, 2022 – May 31, 2022


Translation Notes

  1. The translation of this sentence is a rather poor one, omitting some key words that change the sentence; the original Chinese phrase, 只有真正掌握了元素的奥妙的学者, lends closer to "Only scholars who have truly unraveled the mysteries of the elements can refine such elemental crystals."
  2. The Chinese version specifies that the current library collection is one-sixth of its original size.

Other Languages

Language Official Name Literal Meaning
English Favonius Codex
Xīfēng Mì Diǎn
West Wind Codex
Xīfēng Mì Diǎn
Japanese 西風秘典
Seifuu Hiten
West Wind Secret
Korean 페보니우스 비전
Peboniuseu Bijeon
Favonius Arcane
Spanish Códice de FavoniusFavonius Codex
French Code de FavoniusFavonius Codex
Russian Кодекс Фавония
Kodeks Favoniya
Favonius Codex
Thai Favonius Codex
Vietnamese Tây Phong Mật ĐiểnWest Wind Codex
German Favonius-KodexFavonius Codex
Indonesian Favonius Codex
Portuguese Codex de FavoniusFavonius Codex

Change History

Released in Version 1.0