Alternate versions

Cath Palug (キャスパリーグ, Kyasu Parīgu?), also known as Fou-kun (フォウくん, sometimes translated as "Four"?), is a character that appears in Fate/Grand Order.

He is an alternate iteration of Primate Murder -- inhabiting those timelines wherein the Common Sense of Man pulses with life, and the Twenty-Seven Dead Apostle Ancestors do not exist as an organization. He is known as Beast IV.



Cath Palug is a member of a species of organism known as the Breed of Calamity (災害の種, Saigai no Shuu?), which preside over the principle of "Comparison" (比較, Hikaku?)[1]

Originally a Beast of the Planet that became Merlin's familiar, Cath Palug was at some point subsequent to Merlin's sealing driven from the Isle of Avalon.[2] In those worlds where the Common Sense of Man is insufficiently prominent, he came eventually to be known as Primate Murder -- the pet of Altrouge Brunestud.

In the timeline of Fate/Grand Order, he came to reside within the Chaldea Security Organization, journeying across the assorted eras of human history in the company of Ritsuka Fujimaru and Mash Kyrielight.

Cath Palug describes himself as the Beast of Calamity (災厄の獣, Saiyaku no Juu?) that bears the Characteristic (特徴, tokuchou?, lit. "distinct feature") of "ever exceeding the strength of an opponent" (相手より強くなる, aite yori tsuyokunaru?) -- growing unto maturation by the conflict that arises amongst Men, feeding upon their Envies (妬み, Netami?) and Regrets (悔しさ, Kuyashisa?).[1]

Cath Palug is an entity of the Beast class, holding the title of Beast IV.


Mash Kyrielight describes the Cath Palug as a squirrel-like creature[3] -- "a cute animal," according to his official profile.[4] However, he states that if he were let to normally mature, he would eventually degenerate into an "unsightly monstrosity."[1]Status up cards depict him as having horns, a possible hint at his identity as a beast of man.


Removed of the Civilization of Man, Cath Palug would be nothing more than a harmless animal.[1]

He considers Merlin to be a "loathsome wretch," claiming that the man forced him from comfort of the Tower of Imprisonment (幽閉塔, Yuuhei-Tou?) in Avalon against his will.[1] As such, he frequently attacks Merlin on sight (illustrated in Merlin's card for the April Fool's 2017 event, giving Merlin a flying kick to the face). However, some of his former masters perversion may have rubbed off on him as he has demonstrated making some suggestive remarks on Mash Kyrielight.


Garden of AvalonEdit

Tumblr pz4d5xBuEE1vkuukwo1 1280

Merlin throws out Fou.

While Merlin was imprisoned within the Garden of Avalon, he went through the drafts and sketches he had made in life and started telling Cath Palug the events of the life of King Arthur.[5]

Upon witnessing Arthur's final moments, Merlin releases Cath Palug from the Garden of Avalon, insisting that he seek out "that which is beautiful."[2]

Fate/Grand OrderEdit

Cath Palug is found by the Chaldea Security Organization and given the nickname of "Fou-kun" (フォウくん?).[1] During his stay with the organization, he is permitted to freely wander their facilities.[3]

Fuyuki: Contaminated City in FlamesEdit

Cath Palug is met by Ritsuka Fujimaru alongside Mash Kyrielight.[3]

E Pluribus Unum: Grand Battle of Legends in North AmericaEdit

Merlin uses Cath Palug as a conduit through which to temporarily reveal himself, so to lend aid to the protagonists in the battle against Cú Chulainn Alter.

Babylonia: The Absolute Frontline in the War Against the Demonic Beasts Edit


Cath Palug attacks Merlin

Cath Palug here, interacting with Merlin and the others, with even his identity as a beast being revealed by Ishtar.

Cath Palug smacks Ishtar

Salomon: The Grand Time TempleEdit

In the aftermath of Mash Kyrielight's sacrifice, Cath Palug locates her soul in the place beyond life -- revealing his true name and his nature as a Beast. He then expends the majority of the Magical Energy that he's collected across the centuries of his life to transplant his Force of Providence into Mash's soul, perfectly resurrecting her. However, the act deprives him of both his Sapience (知性, Chisei?) and Characteristic (特性, Tokusei?), leaving him as nothing more than a common animal. In the end, he congratulates Mash and the people of Chaldea for defeating the Beast IV without violence.[1]


Screenshot 20170206-001528

Cath Palug transplanting his Force of Providence to Mash Kyrielight.

Under certain circumstances, Cath Palug is capable of enacting a miracle that exceeds the scope of Magic -- "the Complete Revocation of Death" (死者の完全な蘇生, Shisha no Kanzen-na Sosei?). More specifically, he was able to resuscitate Mash Kyrielight, but this was possible only due to the extra-temporal nature of the context of her death, the interior of Ars Paulina. So to facilitate the process, Cath Palug consumed the majority of the Magical Energy he had accumulated across the centuries of his lifetime, using it to fuel the transference of his Force of Providence to Mash, and overwriting the limitations of her remaining lifespan (3 days). However, as he wasn't yet an adult of his species, he was capable only of granting Mash a lifespan comparable to that of a normal human -- at the cost of his own


Sapience (知性, Chisei?) and his Characteristic (特性, Tokusei?) as a Beast of Calamity.[1]

He has even demonstrated the ability to escape the Chains of Heaven.


Taiki is the illustrator for Cath Palug.


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7

  2. 2.0 2.1 Garden of Avalon - Chapter 06: In the Flower Garden, p.103
  3. 3.0 3.1 3.2 Fate/Grand Order - Fuyuki: Contaminated City in Flames - Prologue
  4. Fate/Grand Order website: Fou: A cute animal who the protagonist meets alongside Mash. It seems to walk around Chaldea freely.
  5. Garden of Avalon - Chapter 00: At the Garden, p.013
Community content is available under CC-BY-SA unless otherwise noted.