“The Artoria Species is like a cancer of the universe.
Someone must reap them out.
—Mysterious Heroine X
Assassin's True Name is Mysterious Heroine X (謎のヒロインＸ, Nazo no Hiroin?), also known as Heroine X (ヒロインＸ, Hiroin X?) and just X, an unknown heroine who tasked herself in eliminating Saber-class heroines during Back Alley Satsuki - Chapter Heroine Sanctuary. Bearing the code name "A-X", X was a stranger who came from the "mysterious dimension" called the Servant Universe. Seeking to accomplish her "true, dearest wish" to "defeat all Sabers", she brandished Secret-Calibur and left her home town, leaving behind an "expression full of bitterness."
Even before arriving at Chaldea, she managed to save an ancient royal dynasty from a crisis, settle the internal strife of the "Mankind Integration Union", and rout invaders from another universe, but such actions were trivial enough for her to not even remember accomplishing them. She will continue to brandish her sword until her goal is completed, and can still be seen "dashing across the sea of stars" even today. No matter what, she also plans to cut down the "Golden Great Emperor Cosmo Gilgamesh."
X has revealed to none that her true identity is actually Artoria Pendragon. While she believes that her "perfect disguise" has tricked everyone, it is asked that others keep the fact quiet to keep from spoiling it and also for the sake of X's own honor.
“It's sticking out...it's sticking out...it's really sticking out.”
—Assassin's profile, on her ahoge
Assassin's appearance is said to be composed of "rough and sporty garments unseemly for Servants." Her blue muffler is a symbol of courage, and her cap is used to hide her identity and ahoge, although it sticks out of the cap.
Mystery Heroine X's wish for the Holy Grail is the destruction of all other sabers. Or at least for them to change their class name to Attacker or Swordsman or something.
- Saber Class
- Mysterious Sailor X
SABER WARS – Lily’s Cosmic Training – The Caliburn AwakensEdit
Salomon: The Grand Time TempleEdit
Musashi Trial QuestEdit
Assassin claims to be the "definitive edition of the Saber Class", acting as an Anti-Saber Decisive Weapon (対セイバー決戦兵器, Tai-Seibā Kessen Heiki?) that "fairly and squarely performs surprise attacks as a knight." She brandishes the "mysterious magic sword" Secret-Calibur to massacre her enemies and uses her favorite ship, the Dun Stallion II (ドゥ・スタリオンⅡ, Du Sutarion II?), to travel through space.
Her Riding ability. She can't ride every possible ride-able object, but when it comes to managing ordinary spaceships, this skill displays a terrific effect. To the point where she can warp even using a ship with no warp function.
Due to a mysterious communication device, the Du Stallion can automatically provide Back-up Fire (支援砲撃, Shien Hōgeki?). In a one-on-one fight between fellow swordsmen, there are no unexplored territories nor soulful tactics.
Galactic Meteor Sword (銀河流星剣, Ginga Ryūsei-ken?) is a power given to Saber that can destroy even stars. Also known as the sword that absolutely kills Sabers. Its attack is super effective against Sabers, so would it be an exaggeration to say that she is the greatest Saber of all?
Ultra Heroine ZEdit
Ultra Heroine Z (ウルトラヒロインZ, Urutora Hiroin Z?) is an alternate version of Mysterious Heroine X who acts as the antagonist of the "Saber Wars" event.
An alternate version of Mysterious Heroine X, created by her events in the past, causing a paradox to kill her after she fulfilled her mission to kill all Sabers and thus, become the most powerful Saber in the past. Ultra Heroine Z is mostly the same as Mysterious Heroine X, but she loathes all Sabers (including Lily and especially Nero) and deems MHX a faillure as a Saber Killer for "opening hersef to the enemy".
Creation and ConceptionEdit
She makes her first appearance in 2013 April Fools.
Nasu Kinoko is the scenario writer for Mysterious Heroine X in Fate/Grand Order. Takashi Takeuchi is the character designer for Mysterious Heroine X. BUNBUN is the character illustrator for Assassin.
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 1.12 1.13 1.14 1.15 1.16 1.17 1.18 1.19 1.20 1.21 1.22 1.23 1.24 1.25 1.26 1.27 1.28
 Fate/Grand Order material III - CHARACTER profile: Mysterious Heroine X, p.114-123 [T]
Mysterious Heroine X
Class: Assassin (Claims to be Saber) True Name: Mysterious Heroine X
Gender: Female Source: 2013 April's fool Region: Servant Universe
Alignment: Chaotic Good Height: 154cm Weight: 42kg
Strength: B Endurance: C Agility: A+ Mana: B Luck: D Noble Phantasm: A++
Scenerio Writer: Nasu Kinoko/Character Designer Draft: Takeuchi Takashi
Character Designer: BUNBUN/Voice Actor: Ayako Kawasumi
Major Appearance Works: Back Alley Satsuki - Chapter Heroine Sanctuary, Fate/Grand Order
Cosmo Reactor: A
A cosmic reactor allowed only to the multiplying Sabers. It is reacting to various things. Settings, for example.
Riding ability. She can't ride every possible rideable object, but when it comes to managing ordinary spaceships, this skill displays a terrific effect. To the point where she can warp even using a ship with no warp function.
Presence Concealment: -
Why the hell do you think a Saber would have that!? It's actually EX, but it is sealed due the user herself completely denying it.
Back-up Fire: EX
Due to a mysterious communication device, the Du Stallion can automatically provide back-up fire. In a one-on-one fight between fellow swordsmen, there are no unexplored territories nor soulful tactics.
Her instincts are considerably lower than the normal Arthuria's, but only when facing a Saber, her instincts rank-up to A.
Galactic Meteor Sword: C
A power given to Saber that can destroy even stars. Also known as the sword that absolutely kills Sabers. Its attack is super effective against Sabers, so would it be an exaggeration to say that she is the greatest Saber of all?
Himitsucalibur: Sword of Unsigned Victory
Rank: A+ Type: Anti-Unit Noble Phantasm Range: 1~99 Maximum Target: 1000 People
The holy swords that boast tremendous power against Sabers. They don't shoot beams, but they are clad on beams. After activating it, every time she swings them, they make a neat low-register woooom woooom noise. ...Hey, I feel like I've already heard this before somewhere. Normally. dual-wielding swords of opposing attributes would cause a tremendous power suppression in both of them, so certainly this could be proof of how the Heroin X is out of the ordinary. She even looks like she is the strongest when mixing light and darkness.
○Motivation · Attitude to the Master
Mysterious Sailor X
Comment from Illustrator
性別：女性 出典：２０１３年エイプリルフール 地域：サーヴァント界
属性：混沌・善 身長：１５４ｃｍ 体重：４２ｋｇ
筋力：Ｂ 耐力：Ｃ 敏捷：Ａ＋ 魔力：Ｂ 幸運：D 宝具：Ａ＋＋
主な登場作品：路地裏さつき ヒロイン十二宮編、Fate/Grand Order
ランク:Ａ＋ 種別：対人宝具 レンジ：１〜９９ 最大捕捉：１０００人
Comment from Illustrator
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 2.16 2.17 2.18 2.19 2.20 2.21 2.22 2.23 2.24 2.25 Fate/Grand Order - Mysterious Heroine X Profile, Translated by Master of Chaos.
- ↑ Fate/Grand Order - Salomon: The Grand Time Temple - Act 09: X / Disposal Chute Andromalius
- ↑ Fate/Grand Order - Mysterious Heroine X interlude 01: Saber Slayer: Dawn
- ↑ Fate/Grand Order - Mysterious Heroine X interlude 02: Saber Slayer: Clash
- ↑ Fate/Grand Order - Mysterious Heroine X interlude 03: Saber Slayer: Awakening