Cath Palug

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Cath Palug (キャスパリーグ, Kyasu Parīgu?), better known as Fou (フォウ, ?), is a character involved with the Grand Order conflicts of Fate/Grand Order.



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."[1] Cath Palug is the Beast of the Planet who became Merlin's familiar, eventually released after Merlin was eternally trapped in the Garden of Avalon in the Reverse Side of the World.[2] In worlds where he did not stay with Merlin, he came to be known as Primate Murder. He is a beast with the property of feeding off the competition and growth of humans, their jealousy and bitterness, and becoming stronger than its opponent.[1] He is known as Beast IV along with the Beast of 666, but it is unknown if they are the same existence.


Mash Kyrielight describes it as a squirrel-like creature.[3] Fou is called a cute animal.[4]


Fou is a harmless animal as long as it doesn't exist in human society.[1]

Fou considers Merlin to be a terrible guy, Fou claims that Merlin chased it out of his comfortable prison tower and released outside.[1]


Garden of AvalonEdit

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

After Merlin witnesses King Arthur last moments, he releases Cath Palug from the Garden of Avalon in the Reverse Side of the World. He insists Cath Palug to seek freedom and to play into something really beautiful.[2]

Fate/Grand OrderEdit

After Cath Palug was released by Merlin, it found the Chaldea Security Organization and was given the nickname Fou.[1] Fou is an animal that appears to be able to freely walk around the Chaldea.[3]

Fuyuki: Contaminated City in FlamesEdit

It is met by the Protagonist while it is alongside Mash Kyrielight.[3]

E Pluribus Unum: Grand Battle of Legends in North AmericaEdit

Merlin uses Cath Palug to temporarily reveal himself in order to help the Protagonist against Cú Chulainn Alter. After stating that they should be able to meet in a slightly different future should the Grand Order project succeed, he disappears.

Salomon: The Grand Time TempleEdit

When Mash sacrifice herself to save the Protagonist. Fou revives Mash and reveals his true nature. Fou admits his defeat by Chaldea and says its farewell.[1]


Cath Palug is capable of enacting a miracle on par with a True Magic -- the complete revocation of death; or more specifically, the revocation of the death of Mashu, which occurred within the confines of the Temple of Time, and was therefore inapplicable in conventional reality. Cath Palug consumed the majority of its Magical Energy, accumulated over the centuries of its lifespan, to the end of transferring its Existential Inertia (運命力, Unmei-ryoku?, lit. "force of destiny) to Mashu, overwriting her remaining lifespan limit of three days. However as Cath Palug hadn't yet entirely matured, it was capable only of granting Mashu a lifespan comparable to that of a normal human. However, this action was performed at the cost of reducing Cath Palug to a normal animal, sans its sapience and unique nature.[1]


Taiki is the illustrator for Fou.


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Fate/Grand Order - Salomon: Grand Time Temple - Ending
  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 Mashu. It seems to walk around Chaldea freely.
  5. Garden of Avalon - Chapter 00: At the Garden, p.013

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