Servant Interlude Dialogue
Bryn2 This Servant is a limited Servant. It is only available during special summoning campaigns. When no such campaigns are active, this Servant cannot be summoned. No plans have been revealed to add this Servant to the permanent summoning pool.

This page is for the Berserker version. For ★5 Assassin, please refer to Mysterious Heroine X.


Mysterious Heroine X (Alter)

★ ★ ★ ★ ★

Japanese Name: 謎のヒロインX〔オルタ〕
AKA: MHX Alter
ID: 155 Cost: 16
ATK: 1717 / 11113 HP: 2079 / 14175
Grail ATK: 12165 Grail HP: 15529
Voice Actor: Kawasumi Ayako Illustrator: BUNBUN
Attribute: Star Growth Curve: Semi S
Star Absorption: 9 Star Generation: 5%
NP Charge ATK: 1.07% NP Charge DEF: 5%
Death Resist: 37.3%
Traits: Servant, Humanoid, Female, Dragon, Artoria, Saberface
Quickicon3  |  Artsicon2  |  Bustericon4  |  Extraicon5

Active Skills Passive Skills Noble Phantasm Ascension Skill Upgrade Bond Level Biography Trivia

Mysterious Heroine X (Alter) is available for summoning during the Valentine 2017 Event Re-Run.

Active Skills Edit

Available from the start
∞ Black Bean Paste EX
Increases own received HP from healing (3 turn).
Recovers own HP.
Level 12345678910
Healing + 20%23%26%29%32%35%38%41%44%50%
Heal + 1000110012001300140015001600170018002000
Cooldown 7777766665
Servants with this Skill

Unlocks after 1st Ascension
Instinct C
Gain critical stars.
Level 12345678910
Stars + 45678910111214
Cooldown 7777766665
Servants With This Skill

Unlocks after 3rd Ascension
Sovereign's Invisible Hand C
Reduce ally's star absorb 100% for 1 turn, and Increase party attack for 3 turns.
Level 12345678910
Attack+ 10%11%12%13%14%15%16%17%18%20%
Cooldown 7777766665
Servants With This Skill

Passive Skills Edit

Mad Enhancement C
Increases damage of unit's Buster cards by 6%
Alter Reactor A
Increases own debuff resistance by 20%

Noble Phantasm Edit

Twin Black Dragon Sword of Promised Victory
Rank Classification Type Hit-Count
A++ Anti-Army Quick 9
Effect Deals high damage to a single target.
Overcharge Effect Extra damage to Saber class servant
Level 1 2 3 4 5
Damage + 1200% 1600% 1800% 1900% 2000%
Charge 100% 200% 300% 400% 500%
Extra Damage + 150% 162.5% 175% 187.5% 200%

Fate Grand Order 謎のヒロインX〔オルタ〕 宝具+エクストラアタック00:45

Fate Grand Order 謎のヒロインX〔オルタ〕 宝具+エクストラアタック

Ascension Edit

Item 1 Item 2 Item 3 Item 4 QP
1st Berserker piece5 Qp100,000
2nd Berserker piece12 Dragon fang18 Qp300,000
3rd Berserker monument5 Medal of Great Knight20 Primordial Lanugo3 Qp1,000,000
4th Berserker monument12 Primordial Lanugo6 Dragons reverse scale5 Qp3,000,000

Skill Reinforcement Edit

Item 1 Item 2 Item 3 Item 4 QP
1st Shiningberserker5 Qp200,000
2nd Shiningberserker12 Qp400,000
3rd Magicberserker5 Qp1,200,000
4th Magicberserker12 Medal of Great Knight10 Qp1,600,000
5th Secretberserker5 Medal of Great Knight20 Qp4,000,000
6th Secretberserker12 Dragon fang12 Qp5,000,000
7th Dragon fang24 Blacktallow4 Qp10,000,000
8th Blacktallow11 Cursed Beast Cholecyst10 Qp12,000,000
9th Crystallized lore1 Qp20,000,000

Stats Edit

Strength: A
Endurance: B
Agility: B
Mana: A+
Luck: C
NP: A++

Bond Level Edit

Bond Level 1 2 3 4 5 6 7 8 9 10
Exp Required 2,000 3,000 4,000 5,000 6,000 230,000 250,000 300,000 380,000 438,000
Total Exp 2,000 5,000 9,000 14,000 20,000 250,000 500,000 800,000 1,180,000 1,618,000
Level 10 Reward 429icon Dark Knight-Kun
When equipped on Mysterious Heroine X (Alter),

While she's on the field,
all enemy's Sabers on the field will receive 20% more damage.

Biography Edit

Unlock Translation
A lonesome Villain (evildoer) that came visiting from the Servant Universe.

A rare literary-type Berserker.
Her magical converter, the Altereactor, blazes with the oath to defeat Mysterious Heroine X; she is an Anti-Anti-Saber final weapon.
You already don't understand what's going on anymore?

---Don't think. Feel.
Bond 1
Fallen Knight Sir Pendragon

Height / Weight: 154 cm . 42 kg
Source: 2017 Valentine's Event
Region: Servant World
Alignment: Neutral Evil Gender: Female

Her prided sword, "Evil Holy Sword Necrocalibur", was bought online from a shady vendor.
Bond 2
"Fight. Defeat Heroine X,

Until the day, you stain the universe with the darkness of Villainy"

The voroid "K6-X4" - aka "Black Knight-kun" - is always watching over the girl who made this oath, from the shadows.

Though it would be more appropriate to say that he is hiding away and skipping work.
Bond 3
A serious and reticent young girl.

Her favourite is sweets. If given the chance, she would want high class Japanese sweets.
A glutton that is costly to feed.
On her off day, she doesn't take a single step away from the Black Round Table-type kotatsu.
Instead, she spends her day reading books and listening to music.

She's basically a slob who can't be bothered about anything.
It is strange that she will follow orders from others, even if she does make sarcastic retorts while doing so.

She is quickly baited with sweet things.
Bond 4
The magical energy conversion furnace Altereactor converts calories into magical energy via the Alternium crystals hidden in her body as a catalyst.

"Sweets containing wasanbon have the greatest efficiency. Also, I want green tea" is what she emphasises.
Spectacles are a necessary item for her boosted optic nerves to rest. In fact, her eyesight deteriorates when putting them on.

The mysterious item that she possesses, the "∞ (Infinity) Black Anko" is made from a combination of the six fundamental forces of
Desire (Soul), Sugar (Power),
Sales Location (Space), Cost Price (Reality),
Production (Time) and Need (Mind),

And though those who wield it are said to obtain infinite power, X Alter doesn't really understand it.
Bond 5
The last survivor of the destroyed and lost dark knight order, the Dark Rounds.

The title granted to her is Sir Pendragon.

She uses a great variety of strangely familiar techniques such as the psychokinetic "Alter Shock" and the ultimate technique of releasing magical energy from the tips of her arms, "Alter Lightning".
Emitting crimson magical energy, the "Evil Holy Sword Necrocalibur" can be freely transformed into twin-blades or a chainsaw, but it seems to get broken and explode easily.
A cool weapon isn't that strong.
That's one of the common laws of the universe.

An ordinary longsword is the best after all.

Trivia Edit

  • The Otaku Version of Mysterious Heroine X from April Fool. Rather than having the same personality what they have is the opposite.
  • She is 6th Class Alter Servant (Berseker) and she is also first ★5 Artoria Alter Servant.
  • Prior to her appearance in the game she was mentioned in FGO material as "「謎のセーラーX」".
  • オルト・ライトニング (Alter Lightning) is the name of her lightning attack.
  • オルト・ライトニング (Alter Lightning) and her double-bladed lightsaber is a parody of Red Lightning and the double-bladed lightsaber used by Darth Maul in Star Wars.
  • Her Extra Attack animation is also parody of Star Wars Episode 1 when Darth Maul killed Qui-Gon Jinn. The Video :