Yuri Eberwein
Yuri Reflection
Yuri in Reflection
Character profile
Other namesUnbreakable Dark / U-D
Successor of the Purple Sky
Yami-chan (by Hayate/Shamal)
The True Darkness of the Book of Darkness
HomeworldOld Belka (?)
FamilyPurple Sky family (portable)
ColorBlack (portable)
Violet (movie)
SystemAncient Belka
DeviceSoul Wings
Japanese nameユーリ・エーベルヴァイン
(Yūri Ēberuvain)
First app.Gears of Destiny
Voiced byKana Asumi

Yuri Eberwein (ユーリ・エーベルヴァイン Yūri Ēberuvain) is a character related to the Book of Darkness introduced in The Gears of Destiny.


Notably, Yuri (ユリ Yuri) is simultaneously an unrelated common Japanese female name (meaning "lily"); the term is also used for an ACG genre about lesbian relationships. Eberwein is a German surname, literally translated as "boar wine".

In the portable continuity, Yuri is also titled the Successor[1] of the Purple Sky (紫天の盟主 Shiten no Meishu, lit. Leader of the Purple Sky), which comes from the Tome of the Purple Sky. When she is Unbreakable Dark (see below), she is also nicknamed by Hayate Yagami and later Shamal as Yami-chan (ヤミちゃん Yami chan).

Alternate continuitiesEdit


Yuri Eberwein GoD

Yuri in The Gears of Destiny

Yuri only appears in The Gears of Destiny, although Unbreakable Dark (see below) has been mentioned by the Materials in The Battle of Aces.

Born in the Ancient Belkan ages, Yuri was originally a single entity. However, due to a program written with the aim of overwriting the Book of the Night Sky, Yuri was turned into Unbreakable Dark (砕け得ぬ闇 Kudake'enu Yami), aka System "Unbreakable Dark" (アンブレイカブル・ダーク Anbureikaburu Dāku) or U-D (U-D Yū Dī) and divided into multiple entities.

She is according to herself and the Materials: The True Darkness of the Book of Darkness and her Examia energies are responsible for the rampages of the Book of Darkness's Defense Program (the Materials themselves) that destroy worlds.

So uncontrollable are her powers that she and her Book of the Purple Sky were transferred into the Book of the Night Sky(which at the time was a Storage Device) causing parts of her program to segment into the Materials with Material-D which serves as the core of both the Defense Program and the Book of Darkness itself(outranking the Book's Master Control Program) segmenting further to create the Wolkenritter.

When battling Vivio Takamachi as U-D in 0066, she mistakes Vivio as the Heiliger Kaiser of the Cradle. From their conversation, it is also revealed that she knows Olivie Sägebrecht.[2]

By the end of the Unbreakable Dark Incident, Yuri eventually has her Examia overwritten by Dearche(similar to how Hayate overwrote the Book of Darkness returning it to becoming the Book of the Night Sky) and is given back the name she had before splitting into U-D and the Materials.


With the name Yuri, she appears in Reflection and Detonation.

Near the end of Reflection, it is revealed by Iris (who calls Yuri a Demon) that she died during a disaster caused by Yuri decades ago, and now she is going to take revenge. When Yuri is unsealed/wakened from the Examia crystal, she is quickly mind-controlled by Iris with the virus codes before their conversion is finished, causing her to attack the Administrative Bureau mages including Fate T. Harlaown and Signum with Crystal Tree.

Brave DuelEdit

Yuri Eberwein is an international student studying abroad in Uminari City.



U-D's awakened form with Soul Wings in The Gears of Destiny

As Unbreakable Dark, Yuri possesses the Examia (永遠結晶(エグザミア) Eguzamia, lit. Forever Crystal) crystal as the core supported by the Eternal Ring (無限連環(エターナルリング) Etānaru Ringu) program. The system can only be controlled by the Tome of the Purple Sky, and it is able to regenerate the leftover of the Book of Darkness into Dark Fragments.

As an individual, Yuri herself possesses the Soul Wings as weapon, instead of wielding a Device like the Materials.

Protective ClothingEdit

Yuri's protective clothing, probably a Barrier Jacket as she does not wield a weapon, is known as Purple Sky Attire (紫天装束 Shiten Shōzoku). During the time when Yuri is U-D, if her defensive force field is destroyed, she will be awakened and engulfed by a destructive urge, and the Attire will also turn into a reddish variation.[3]

In the movie continuity, Yuri's protective clothing has an original new design with violet instead of purple color.


Ancient MatrixAncient BelkaAttackShooting
Crystal TreeAncient BelkaAttackMagic-enhanced attack
Eternal SaberAncient BelkaAttackMagic-enhanced attack
Javelin (spell)Ancient BelkaAttackShooting
Napalm BreathAncient BelkaAttackMagic-enhanced attack
Vesper RingAncient BelkaAttackShooting

In the gamesEdit

Spells in The Gears of Destiny

Cross Range Long Range Long Range (Charged)
Attack/Basic[unnamed]Eternal Saber
Block/HighNapalm BreathVesper Ring
Catch/Bind[unnamed grab attack]Javelin
△△EX AttackViper---
LFDBAncient Matrix---



  1. ^ Magical Girl Lyrical Nanoha INNOCENT, English name of Yuri's AI-NPC.
  2. ^ Magical Girl Lyrical Nanoha A's Portable: The Gears of Destiny, Final Sequence Destiny 50 Battle 2F.
  3. ^ Magical Girl Lyrical Nanoha A's Portable: The Gears of Destiny, Final Sequence Destiny 50.