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A national treasure of Byakuyakoku stored in the Dainichi Mikoshi. With the coming of the Serpent God, this item was used to notarize great oaths and wishes.

Oathsworn Eye is a 4-Star Catalyst obtained from the Three Realms Gateway Offering Event by upgrading the Bokuso Box to Level 4.

Ascensions and Stats

Level Base
2nd Stat
0✦ 1/20 44 6%
20/20 119 10.6%
Ascension Cost (0 → 1)
Item Mora.png 5,000 Mora
1✦ 20/40 144 10.6%
40/40 226 15.5%
Ascension Cost (1 → 2)
Item Mora.png 15,000 Mora
2✦ 40/50 252 15.5%
50/50 293 17.9%
Ascension Cost (2 → 3)
Item Mora.png 20,000 Mora
3✦ 50/60 319 17.9%
60/60 361 20.3%
Ascension Cost (3 → 4)
Item Mora.png 30,000 Mora
4✦ 60/70 387 20.3%
70/70 429 22.7%
Ascension Cost (4 → 5)
Item Mora.png 35,000 Mora
5✦ 70/80 455 22.7%
80/80 497 25.1%
Ascension Cost (5 → 6)
Item Mora.png 45,000 Mora
6✦ 80/90 523 25.1%
90/90 565 27.6%

Total Cost (0 → 6)

Item Mora.png 150,000 Mora


Refining Oathsworn Eye requires Ointment of Sight instead of an identical weapon. Ointment of Sight can be obtained from the Three Realms Gateway Offering Event by upgrading the Bokuso Box to Levels 5, 9, 10 and 14.


"You wish for me to become your deity?"
The giant white snake gazed down at the child standing before him.
"It was because I could best neither the golden god[Note 1] nor Narukami that I elected to flee into waters unknown."
"If you keep seeking the light, you will experience loss in the future."
"My life is worth nothing. I've had enough of it all — of eking out this existence, of being shamed for blasphemy."

The giant serpent then showed forth a jewel that glimmered like snake-eyes.
"In that case, swear it upon this eye."
"This was also how I made a pact with my coral servants."

"Have you forgotten Master Spartacus' teachings?"
"We must never worship a god! We can only rely on ourselves!"
The white serpent said nothing, for it respected the will of the people dwelling in the depths.
If vain worship was supplanted by new belief,
Then would it not dishonor those who fought?

"I'll swear it. I'll swear it here, before this eye."
"All is as it was when I lost everything."

"The years have passed swiftly. The island is complete. The vishaps are repelled, and the Holy Soil may now be governed."
"House of Sangonomiya, gathered Jibashiri, and my vassals — the oath sworn upon the eye has come to fruition."
"From today, if two or more parties should be dissatisfied with the arrangement concerning Enkanomiya, or should you decide otherwise than you first did,"
"May the tower of the sun hear your wishes and collapse of its own accord, destroying all that was once your past."

Saying these final words,
The serpent god took the remaining people to the surface.
It was time to fulfill his oath to the heavenly city...



Other Languages

LanguageOfficial NameLiteral Meaning
EnglishOathsworn Eye
Zhèngshì zhī Míngtóng
Zhèngshì zhī Míngtóng
Chikai no Akimi[!]
Light Pupil of Oath
Korean맹세의 눈동자
Maengse-ui Nundongja
Pupil of Oath
SpanishOjo del JuramentoEye of the Oath
FrenchŒil d'assermentationEye of Swearing-in
RussianОко клятвы
Oko klyatvy
Oath's Eye
ThaiOathsworn Eye
VietnameseCon Ngươi Tuyên ThệPupil of Oath
GermanAuge des GelöbnissesEye of the Vow
IndonesianOathsworn Eye
PortugueseOlho do JuramentoEye of the Oath

Change History

Released in Version 2.5


  1. The original CN text uses the words "贵金" which translate literally to "Expensive Gold" rather than "Golden". In normal use, "贵金" refers to precious metals used to mint currency. Therefore a better translation would be "God of Coinage Metals"