It can only be obtained by participating in the time-limited event Grail Live. This Servant cannot be summoned.
This article is about 4★
Mysterious Idol X (Alter). For other variations, see Artoria (Disambiguation).

Servant | Dialogue |
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Japanese Name: 謎のアイドルX〔オルタ〕 | |
AKA: MIXA | |
ID: 308 | Cost: 12 |
ATK: 1,507/9,045 | HP: 1,980/12,375 |
Lv.100 Grail ATK: 10,952 | Lv.100 Grail HP: 15,004 |
Lv.120 Grail ATK: 12,859 | Lv.120 Grail HP: 17,634 |
Voice Actor: Kawasumi Ayako | Illustrator: BUNBUN |
Attribute: Star | Growth Curve: S |
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Alignments: Neutral・Good |
Gender: Female | |
Traits: Arthur, Dragon, Existence Outside the Domain, Female, Hominidae Servant, Humanoid, King, Round Table Knight, Saberface, Servant | |
Hits: ![]() ![]() ![]() ![]() |
Active Skills | Passive Skills | Append Skills | Noble Phantasm | Ascension |
Skill Upgrade | Bond Level | Biography | Trivia | Images |
Active Skills
Available from the start |
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Increases own Quick performance for 3 times, 3 turns. Increases own Buster performance for 3 times, 3 turns. ![]() | ||||||||||
Level | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
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20% | 21% | 22% | 23% | 24% | 25% | 26% | 27% | 28% | 30% |
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20% | 21% | 22% | 23% | 24% | 25% | 26% | 27% | 28% | 30% |
Cooldown | 7 | 6 | 5 |
Unlocks after 1st Ascension |
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Increases own critical damage for 1 turn. Increases own damage against Mechanical enemies for 3 turns. | ||||||||||
Level | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
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50% | 55% | 60% | 65% | 70% | 75% | 80% | 85% | 90% | 100% |
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30% | 32% | 34% | 36% | 38% | 40% | 42% | 44% | 46% | 50% |
Cooldown | 6 | 5 | 4 |
Unlocks after 3rd Ascension |
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Increases party's attack for 3 turns. Recovers party's HP. | ||||||||||
Level | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
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10% | 11% | 12% | 13% | 14% | 15% | 16% | 17% | 18% | 20% |
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1000 | 1100 | 1200 | 1300 | 1400 | 1500 | 1600 | 1700 | 1800 | 2000 |
Cooldown | 7 | 6 | 5 |
Passive Skills
1 | ![]() |
Existence Outside the Domain D |
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2
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Mad Enhancement C |
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3 | ![]() |
Altereactor B |
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Append Skills
Unlocks by consuming Servant Coins |
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Extra Attack Finesse Improvement | |||||||||
Increases own Extra Attack performance. | ||||||||||
Level | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
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30% | 32% | 34% | 36% | 38% | 40% | 42% | 44% | 46% | 50% |
Unlocks by consuming Servant Coins |
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Mana Loading | |||||||||
Starts battle with NP gauge. | ||||||||||
Level | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
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10% | 11% | 12% | 13% | 14% | 15% | 16% | 17% | 18% | 20% |
Unlocks by consuming Servant Coins |
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Anti-Berserker Attack Damage Aptitude | |||||||||
Increases own attack against ![]() | ||||||||||
Level | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
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20% | 21% | 22% | 23% | 24% | 25% | 26% | 27% | 28% | 30% |
Noble Phantasm
![]() Base Damage: x0.8 |
Rank | Noble Phantasm Type | |||
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B | Anti-Unit | ||||
Hits | Per Hit Percentage | ||||
4 | 10%, 20%, 30%, 40% | ||||
Effect | Deals damage to all enemies.![]() | ||||
NP Level | 1 | 2 | 3 | 4 | 5 |
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600% | 800% | 900% | 950% | 1000% |
Overcharge Effect | Increases own Quick performance for 1 turn. (Activates first) | ||||
Charge | 100% | 200% | 300% | 400% | 500% |
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20% | 25% | 30% | 35% | 40% |
Ascension
n° | Item 1 | Item 2 | Item 3 | Item 4 | QP |
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1st | ![]() |
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2nd | ![]() |
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3rd | ![]() |
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4th | ![]() |
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Skill Reinforcement
n° | Item 1 | Item 2 | Item 3 | Item 4 | QP |
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1st | ![]() |
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2nd | ![]() |
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3rd | ![]() |
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4th | ![]() |
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5th | ![]() |
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6th | ![]() |
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7th | ![]() |
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8th | ![]() |
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9th | ![]() |
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n° | Item 1 | Item 2 | Item 3 | Item 4 | QP |
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1st | ![]() |
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2nd | ![]() |
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3rd | ![]() |
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4th | ![]() |
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5th | ![]() |
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6th | ![]() |
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7th | ![]() |
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8th | ![]() |
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9th | ![]() |
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Stats
Strength: C![]() |
Endurance: C![]() |
Agility: B![]() |
Mana: B+![]() |
Luck: A![]() |
NP: B![]() |
Bond Level
Bond Level | 1 ![]() |
2 ![]() |
3 ![]() |
4 ![]() |
5 ![]() |
6 ![]() |
7 ![]() |
8 ![]() |
9 ![]() |
10 ![]() |
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Bond Required | 1,500 | 2,250 | 3,000 | 3,750 | 4,500 | 225,000 | 260,000 | 270,000 | 300,000 | 395,000 |
Total Bond | 1,500 | 3,750 | 6,750 | 10,500 | 15,000 | 240,000 | 500,000 | 770,000 | 1,070,000 | 1,465,000 |
Rewards | ![]() |
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![]() Bond CE |
Bond 10 Craft Essence | ![]() |
My Galaxy DEMO Tape When equipped on Mysterious Idol X (Alter), increases party's damage against target with Mechanical-trait by 15%, and Evil-alignment by 15% when she is on the field | ||||||||
![]() Chaldean Visionary Flames [?] |
11 ![]() |
12 ![]() |
13 ![]() |
14 ![]() |
15 ![]() | |||||
1,090,000 | 1,230,000 | 1,360,000 | 1,500,000 | 1,640,000 | ||||||
2,555,000 | 3,785,000 | 5,145,000 | 6,645,000 | 8,285,000 | ||||||
Rewards | ![]() ![]() |
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Biography
Unlock | Description | Translation🛈 |
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Default | ||
Bond 1 | ||
Bond 2 | ||
Bond 3 | ||
Bond 4 | ||
Bond 5 | ||
Reach Bond Level 5 and Clear Grail Live. | ||
Extra | ||
April Fool |
- This translation was made by Merukurio. Thanks for all the hard work.
Trivia
- Mysterious Idol X (Alter) is the first Event Reward 4★ Foreigner.
- She is the third Foreigner not associated with a Lovecraftian horror, after Mysterious Heroine XX and Voyager.
Images
Grail Live story only
Grail Live story only
Illustration by BUNBUN
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5 ★ | Abigail Williams • Katsushika Hokusai • Yang Guifei • Voyager • Abigail Williams (Summer) • Van Gogh • Jacques de Molay • Koyanskaya of Darkness |
4 ★ | Mysterious Heroine XX • Mysterious Idol X (Alter) |