GilgameshNotice.png This Servant is LOCKEDLocked.png until you complete E Pluribus Unum and will be added to the summoning pool once the quests are completed.

If you're looking for other variations, please see Chulainn (Disambiguation).

Servant Dialogue Interlude
★ ★ ★ ★ ★

Cú Chulainn (Alter)

Japanese Name: クー・フーリン〔オルタ〕
AKA: Cú Alter, Mad King Cú Chulainn
ID: 98 Cost: 16
ATK: 1,979/12,805 HP: 1,790/12,210
Grail ATK: 14,017 Grail HP: 13,377
Voice Actor: Canna Nobutoshi Illustrator: Shimadoriru
Attribute: Earth Growth Curve: Reverse S
Critabsup.png Star Absorption: 9 Stargainup.png Star Generation: 5.1%
Npchargeup.png NP Charge ATK: 0.69% NPGainUpDmg.png NP Charge DEF: 5%
Instapowerup.png Death Rate: 52% Alignments: Chaotic・Evil
Gender: Male
Traits: Brynhildr's Beloved, Divine, Humanoid, Male, Servant, Weak to Enuma Elish
Hits:  Quick Hits4  |  Arts Hits3  |  Buster Hits3  |  Extra Hits5
Active Skills Passive Skills Noble Phantasm Ascension Skill Upgrade
Stats Bond Level Biography Trivia Images

 Active Skills

Available from the start
Madness of the Spirits A
Reduces all enemies' attack for 3 turns.
Reduces their critical attack chance for 3 turns.
Level 1 2 3 4 5 6 7 8 9 10
Attackdown.png Attack - 10% 11% 12% 13% 14% 15% 16% 17% 18% 20%
Critchndown.png Crit Chance - 30% 32% 34% 36% 38% 40% 42% 44% 46% 50%
Cooldown 8 7 6

Unlocks after 1st Ascension
Protection from Arrows C
Avoid.png Grants self Evasion for 2 attacks.
Increases own defense for 3 turns.
Level 1 2 3 4 5 6 7 8 9 10
Defenseup.png Defense + 7% 7.7% 8.4% 9.1% 9.8% 10.5% 11.2% 11.9% 12.6% 14%
Cooldown 7 6 5

Unlocks after 3rd Ascension
Battle Continuation A
Grants self Guts status for 1 time, 5 turns.
Level 1 2 3 4 5 6 7 8 9 10
Gutsstatus.png Revives with 1000 HP 1150 HP 1300 HP 1450 HP 1600 HP 1750 HP 1900 HP 2050 HP 2200 HP 2500 HP
Cooldown 9 8 7

Passive Skills

Mad Enhancement EX (C)
Busterupstatus.png Increases own Buster performance by 6%.
Divinity C
Powerup.png Increases own damage by 150.

Noble Phantasm

Curruid Coinchenn
Beast of Crunching Deathtusk

Base Damage: x1.5
Rank Noble Phantasm Type
A Anti-Unit
Hits Per Hit Percentage
12 2%, 5%, 7%, 10%, 5%, 7%, 10%, 5%, 7%, 10%, 5%, 27%
Effect Deals damage to one enemy.
NP Level 1 2 3 4 5
Powerup.png Damage + 600% 800% 900% 950% 1000%
Overcharge Effect Increases own attack for 1 turn. (Activates first)
Increases own defense for 1 turn. (Activates first)
Charge 100% 200% 300% 400% 500%
Attackup.png Attack + 30% 40% 50% 60% 70%
Defenseup.png Defense + 30% 40% 50% 60% 70%


Item 1 Item 2 Item 3 Item 4 QP
1st Berserker piece.png5 QPicon.png100,000
2nd Berserker piece.png12 Unlucky bone.png22 QPicon.png300,000
3rd Berserker monument.png5 Talon of chaos.png6 Heart of a foreign god.png2 QPicon.png1,000,000
4th Berserker monument.png12 Heart of a foreign god.png4 Bloodstone Tear8 QPicon.png3,000,000

Skill Reinforcement

Item 1 Item 2 Item 3 Item 4 QP
1st Shining_Gem_of_Madness5 QPicon.png200,000
2nd Shining_Gem_of_Madness12 QPicon.png400,000
3rd Magic Gem of Madness5 QPicon.png1,200,000
4th Magic Gem of Madness12 Talon of chaos.png3 QPicon.png1,600,000
5th Secretberserker.png5 Talon of chaos.png6 QPicon.png4,000,000
6th Secretberserker.png12 Unlucky bone.png15 QPicon.png5,000,000
7th Unlucky bone.png29 Snake jewel.png5 QPicon.png10,000,000
8th Snake jewel.png15 Void's Refuse48 QPicon.png12,000,000
9th Crystallized lore.png1 QPicon.png20,000,000


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

Bond Level

Bond Level 1 BoundLevel1.png 2 BoundLevel2.png 3 BoundLevel3.png 4 BoundLevel4.png 5 BoundLevel5.png 6 BoundLevel6.png 7 BoundLevel7.png 8 BoundLevel8.png 9 BoundLevel9.png 10 BoundLevel10.png
Bond Required 5,000 15,000 10,000 2,000 18,000 150,000 430,000 340,000 320,000 405,000
Total Bond 5,000 20,000 30,000 32,000 50,000 200,000 630,000 970,000 1,290,000 1,695,000
Bond 10 Reward CE 355icon.png One-Man War
When equipped on Cú Chulainn (Alter),
Increases own NP damage by 30%.
Grants self Guts status for 1 time. (Revives with 20% HP.)
Chaldean Visionary Flames [?]
11 BoundLevel1.png 12 BoundLevel2.png 13 BoundLevel3.png 14 BoundLevel4.png 15 BoundLevel5.png
1,090,000 1,230,000 1,360,000 1,500,000 1,640,000
2,785,000 4,015,000 5,375,000 6,875,000 8,515,000


Unlock Description Translation
Default ケルト・アルスター伝説の勇士。


The legendary warrior of the Ulster Cycle of Celtic mythology.

A member of the Red Branch Knights and the strongest fighter of Ulster, he won his fame with his mastery of the invincible spear techniques taught to him by Scáthach, the ruler of the alternate realm called the Land of Shadows.
He has unusually taken form as a Berserker.
Some factor of his summoning also caused all of his equipment to change and reversed his temperament.
His expressions become cold, and the crimson demonic spear that is his Noble Phantasm has been mixed with darkness, overflowing with a foreboding aura.

Bond 1 身長/体重:185cm・72kg

属性:混沌・悪  性別:男性

Height/Weight: 185 cm ・ 72 kg

Source: Celtic Mythology
Region: Ireland
Alignment: Chaotic ・ Evil
Gender: Male
His Rune Magic is used only to strengthen his body.

Bond 2 精霊の狂騒:A


Madness of the Spirits: A

The roar of Cú Chulainn awakens the spirits sleeping within the earth and crushes the will of enemy forces. This mental interference causes a temporary decrease in STR and AGI in all enemies.

Bond 3 クー・フーリンが女王メイヴの願望によって変転した姿。



Cú Chulainn's mutated figure by means of Queen Medb's desire. He wolfs down on the land of America as Mad King Cú Chulainn.

This is not even the mad warrior condition from when alive; he has been summoned as a different figure than a proper Berserker.
When receiving the backup from the Holy Grail, his strength surpasses even when in Lancer or Caster conditions.

Bond 4 『抉り穿つ鏖殺の槍』

ランク:B++ 種別:対軍宝具
レンジ:5~50 最大捕捉:100人

Gouging Piercing Spear of Carnage

Rank: B++
Type: Anti-Army
Range: 5~50
Maximum Targets: 100 people
Gáe Bolg.
Homing magic spear missile.
Cú Chulainn's proper Noble Phantasm.
Because, while an Alter, he performs a full-power thrown while prepared for the collapse of his own body, both power, and effective range has been raised when compared to normal summoning.
There is an instant-death effect towards the entire enemy camp and, even if instant death is avoided, it still gives great damage.
(Because he is throwing while "making the collapsing body regenerate" by means of rune magecraft, Cú Chulainn receives no damage himself-- if you exclude outrageous amount of pain).

Bond 5 『噛み砕く死牙の獣』

ランク:A 種別:対人宝具(自身)
レンジ:─ 最大捕捉:1人
攻撃型骨アーマー。着用することで耐久がランクアップし、筋力パラメーターはEXとなる。 この宝具を発動している最中は『抉り穿つ鏖殺の槍』は使用できない。

Beast of Crunching Deathtusk

Rank: A
Type: Anti-Unit (Self)
Range: -
Maximum Targets: 1 person
Curruid Coinchenn.
The anger of the raging Cú Chulainn temporarily embodies the exoskeleton of Marine Beast Curruid - the monster of the crimson sea that became the basis for the magic spear Gáe Bolg - and clads it over his body like an armor.
Attack-type bone armor. By wearing it, END is Rank UP and STR parameter becomes EX.
While this Noble Phantasm is active, he cannot employ the "Gouging Piercing Spear of Carnage".

Clear Interlude 1
Extra 第五章における災厄クラスのエネミー。


A calamity class enemy from the Fifth Order.

Since it came to this, it would be better to just summon a certain Archer that equipped a mythological Mystic Code as a protagonist and have them fight in a mysterious space from a Sunday morning show, but what do you think?

April Fool   Bad-Type Servant

Since he's covered in thorns, you can just roll him at enemies to damage them, just like a certain hedgehog. Not only that, but the thorns also protect him from ambushes while he sleeps! Pretty clever for a Berserker.


  • He has the highest ATK values out of all Berserkers.
  • He has the 3rd highest ATK values out of all servants.


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