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Mysterious Heroine X (Assassin)

FGO Mysterious Heroine X (Assassin), Pros and Cons, Rating, Strategies and Tips, Stats, Skills, Wiki, and Noble Phantasm.
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update 03/09/2017
Mysterious Heroin X
Mysterious Heroine X (Assassin)
Assassin
Mysterious Heroine X (Alter)
Berserker (Alter)

Overview

Mysterious Heroine X (Assassin)

Mysterious Heroine X is a limtied servant and currently unavailable in the Story Summon. She first appeard in the Saber Wars Event Pickup Summon

RarityCostClass
5★16Assassin
Assassin
Rating7.5/10

Mysterious Heroine X or MHX for short is kind of a special servant as her skillset are meant to fight Saberface servants. However, outside of that, her usability falls off quite a bit as she isn’t that good when going up against other kinds of enemies.

Pros

  • High critical stars generation rate. Even though MHX’s stars generation rate isn’t as high as Jack the Ripper due to one less hit on her Quick card, but it is still on par with the other star focused servants such as Okita Shouji.

  • NP as a star generation tool. It is possible to use MHX’s NP as a tool to generate large amount of critical stars due to it being a Quick type and its high number of hit counts on one enemy, which can generate about 15 to 20 critical stars with overkill. As MHX is usually used within a Quick party that trades off raw damage output for high critical rate, the damage dealt maybe somewhat inconsistent. However, her NP alone at Level 1 deals quite a lot of damage without any buff which is often comparable to Scathach’s NP.

  • Fire Support, MHX' stun skill, hits all enemies. Stuns are usually used in boss battles where you want to restrict the actions of one powerful enemy unit. This is especially so in key moments such as delaying the deployment of enemy noble phantasms. Being able to inflict stun on all or most of the enemy units would be equivalent to invincibility or a free turn.

Cons

  • Skills are hard to use. MHX’s skillset is kind of mediocre with the stun from her first skill, Fire Support doesn’t even reach 100% success rate at max level, not to mention it only triggers one turn later. Her second skill, Instinct is straightforward critical stars gain but her third skill, Galaxy Meteor Sword only works when going up against Saberface enemies. If you don’t know what a Saberface is, they are technically servants that have almost the same face like the game’s mascot, Artoria Pendragon or more commonly known as Saber by the community. Therefore, it is a very situational skill to have as there aren’t many Saberface enemies out there.

  • Mysterious Heroine X’s survivability is not good right out the box. She badly needs her strengthening quest for Instinct to turn it into Star of Saber, adding 1 turn invincibility on top of the star gain effect. This vastly increases her survivability and protects her from enemy NPs.

Strategies & Tips

MHX is a critical focused servant that mainly utilizes her high star generation rate to slice her enemies into pieces with criticals. Even though she fell short quite a bit compared to other Assassins like Jack the Ripper in terms of damage, she is still able to perform quite well and you can see her full potential when fighting against Saberface servants.

Noble Phantasm

MHX’s Noble Phantasm, Himitsucalibur is a single target 12 hits NP that deals extra damage if the target has the Saberface trait. Without taking into account the extra damage dealt as it is quite situational, her NP damage is still quite good and it can generate lots of critical stars for next turn’s attack.

Best Servants to Work with

ServantExplanation
Scathach (Assassin)
Scathach (Assassin) [JP]
Scathach can support MHX by increasing her Quick cards performance for a turn with her Primeval Rune skill while dealing quite a bit of damage on her own especially with her NP.
Atalante
Atalante
The same use as Scathach by enhancing Quick cards performance while generating critical stars with her NP.
Zhuge Liang
Zhuge Liang
Even though MHX herself is quite efficient in building up her NP gauge but additional NP charges are also welcomed, coupled with defensive buffs to increase her survivability.

Best CEs

CEExplanation
Imaginary Around
Imaginary Around
Quick Cards Performance
Best CE to equip MHX with to enhance her Quick cards performance.
Piece of Year 2030
Piece of Year 2030
Star Generation
The additional supply of critical stars every turn makes MHX’s star generation rate much more stable even if you do not draw her Quick cards.
Sometime in Summer
Sometime in Summer
NP Charge Up
In additional to the increase in NP damage and Quick cards performance, it also allows MHX to use her NP much faster with the 30% NP charge at the start, 50% if limit break.

Max Bond Level CE

CEEffect
Extermination List
Extermination List
When equipped to Mysterious Heroine X (Assassin) only, apply 20% Damage Plus against [Saber] enemies for all allies while on the field

Stats

LvlHPATK
Base1,8621,817
Lv507,8207,286
Lv9012,69611,761
Lv10013,90912,874

Hidden Stats

NP Charge (ATK)0.81%
NP Charge (DEF)4%
Star Weight98
Star Rate25.6%
Death Resist38.5%
AlignmentLawful, Good
AttributeStar
TraitsFemale, Altria, Humanoid, Dragon, Riding, Saberface, Servant

Noble Phantasm

Himitsucalibur (Secretcalibur) (Rank A+)

Deal damage to a single enemy
[Overcharge] Deals extra damage against [Saberface] enemies

RankA+
ClassificationAnti-Personnel
TypeQuick
Hit-Count12
LvlDamage +ChargeExtra Damage +
11200%100%150%
21600%200%162.5%
31800%300%175%
41900%400%187.5%
52000%500%200%

Himitsucalibur (Secretcalibur) (Rank EX)

Deal damage to a single enemy
[Overcharge] Deal extra damage against [Saberface] enemies

RankEX
ClassificationAnti-Personnel
TypeQuick
Hit-Count12
LvlDamage +ChargeExtra Damage +
11600%100%150%
22000%200%162.5%
32200%300%175%
42300%400%187.5%
52400%500%200%

Skills

Upgrade Priority

1 > 2 > 3

Although the first skill, Fire Support has a success rate of 80% at max level, we would like to prioritize it as the first skill to be levelled as it can stun multiple targets. Next, we raise her second skill to generate more critical stars along with quite a short cooldown of five turns at max. We leave the third skill for the last as it only works against Saberface servants making its range of usability very limited.

Fire Support EX

Fire Support EX

Available from the start
After a turn this skill is activated, chance to immobilize all enemies (1 turn)

LvlStun ChanceCooldown
160%10
262%10
364%10
466%10
568%10
670%9
772%9
874%9
976%9
1080%8

Instinct C+

Instinct C+

Unlocks after 1st Ascension
Gain C. Stars for yourself

LvlStars +Cooldown
147
257
367
477
587
696
7106
8116
9126
10145

Star of Saber C++

Instinct C+

Available after the Skill Strengthening Quest replacing Instinct C+
Apply Invincible for yourself
Gain C. Stars for yourself

LvlStars +Cooldown
1107
211
312
413
514
6156
716
817
918
10205

Galaxy Meteor Sword C

Galaxy Meteor Sword C

Unlocks after 3rd Ascension
Increase your C. Star Drop Rate when attacking [Saber] enemies (3 turns)
Apply Special Attack [Saber] (3 turns) for yourself

LvlStar Rate +Attack +Cooldown
150%30%8
255%32%8
360%34%8
465%36%8
570%38%8
675%40%7
780%42%7
885%44%7
990%46%7
10100%50%6

Class Skills

Riding EXRiding EX
Increase your Quick Card effectiveness by 12%
Cosmo Reactor ACosmo Reactor A
Increase your C. Star Drop Rate by 10%

Command Cards

QuickQuickArtsArtsBuster
CardQuick
Quick
Arts
Arts
Buster
Buster
Extra
Extra
Hit-Count4214

MHX’s command card performance is very good with excellent NP gain coupled with high star generation rate especially if you managed to line up a brave chain.

NP Gain

1st2nd3rd
6810
6811
611
457
B / Q79
000

Bond Level

LvlExp RequiredTotal Exp
13,5003,500
28,50012,000
37,00019,000
46,00025,000
52,50027,500
6292,500320,000
7360,000680,000
8340,0001,020,000
9320,0001,340,000
10315,0001,655,000

Skill Enhancement Materials

LvlQP CostMaterials
1 → 2200,000Shining Gem of Killingx5 Gem (Assassin)
2 → 3400,000Shining Gem of Killingx12 Gem (Assassin)
3 → 41,200,000Magic Gem of Killingx5 M. Gem (Assassin)
4 → 51,600,000Magic Gem of Killingx12 M. Gem (Assassin)
Phoenix Plumex4 Phoenix Feather
5 → 64,000,000Secret Gem of Killingx5 S. Gem (Assassin)
Phoenix Plumex8 Phoenix Feather
6 → 75,000,000Secret Gem of Killingx12 S. Gem (Assassin)
Dragon Fangx12 Dragon Fang
7 → 810,000,000Shadow Servantx12 Void's Dust
Dragon Fangx24 Dragon Fang
8 → 912,000,000Shadow Servantx36 Void's Dust
Octuplet Twin Crystalsx24 Octuplet Twin Crystals
9 → 1020,000,000Crystallized Lore​x1 Crystallized Lore​

Ascension Materials

AscensionQP CostMaterials
1st100,000Assassin Piecex5 (Assassin Piece)
2nd300,000Assassin Piecex12 (Assassin Piece)
Dragon Fangx18 (Dragon Fang)
3rd1,000,000Assassin Monumentx5 (Assassin Monument)
Dragons Reverse Scalex2 (Dragons Reverse Scale)
Phoenix Plumex8 (Phoenix Plume)
4th3,000,000Assassin Monumentx12 (Assassin Monument)
Dragons Reverse Scalex4 (Dragons Reverse Scale)
Heros Proofx36 (Heros Proof)

Saber Wars event

Other Servants

Comments

Impstar
Actually, her third skill works against all Saber enemies. At max rank, she does as much damage to Saber enemies as Archer class Servants do, and it boosts her star generation as well.

It's still a niche skill, but not as much as you're making it out to be. It's her NP that only gets bonus damage against Saberface enemies.

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