Caster (キャスター, Kyasutā?) is a Caster-class Servant able to be summoned by the Protagonist in the Grand Orders of Fate/Grand Order.




True Name is Cú Chulainn, the Child of light (光の御子, Hikari no miko?), a hero from the Ulster Cycle of Irish mythology. He was a demigod, the offspring of a mortal woman, Deichtine, the younger sister of King Conchobar mac Nessa, and the deity, Lugh, the god who governed over the sun and a member of the Danann divine family in Celtic Mythology. Deichtine, the daughter of a druid, Conchobar's father, and Maga, the widow of Ross the Red, disappeared in the Land of the Young without marrying anyone. There, she bore Sétanta (セタンタ, Setanta?), the child of the sun god.[2][3]

Hound of CulannEdit



Sétanta was born in Ireland when it was still a land named after its abundant greenery, Erin, meaning "green" in Gaelic. Receiving great divinity from his father, who possessed every skill such as knowledge, techniques, and magic, he exhibited superior talent from birth and boasted supernatural ability that separated him from ordinary people from a young age. The land was split into five countries, and he was sent with his uncle, Fergus mac Róich, to King Conchobar's army under the Northern kingdom of Ulster. He was to have a life that would follow the destiny to "one day become a shield of Ulster."

He took up the name Cú Chulainn after accidentally killing the guard dog protecting the house of master blacksmith Culann. The guard dog was well-known to have the strength of ten men.[2] The King was to take Sétanta with him after receiving an invitation to Culann's home, but Sétanta was in the middle of a hurling match with his friends. He would have lost the match had he withdrawn at that point, so he said, "I'll catch up after I win, so go right ahead." The King was humored the reply, and, allowing him to come late, went to the house first. Tragedy began after one of Culann's servants accidentally closed the gate.

Arriving late, Sétanta was attacked by "Culann's savage dog", well known as having the strength of ten men. He alone strangled it to death with his bare hands, and the people inside gathered at the gate after hearing the commotion. Upon learning that Sétanta defeated the guard dog, they were full of shock and admiration. There was some sadness in Culann's eyes at losing his prized guard dog, so Sétanta, ashamed of his actions told him "Does this dog have children? If he does, could you allow me to take care of them? I will raise them to be guard dogs just as strong as their father. Until then, I will be your guard dog."[2][4][1][3]

Culann, impressed with the boy's offer responded to him with assurance that "I have no need of that. I will be the one to raise the dogs that will protect my manor. You, on the other hand, must train yourself. After all, you will one day be the guard dog of all of Ulster." All of the warriors at the scene nodded in agreement. Consequently, all began to call the boy "Culann's savage dog", Cú Chulainn in Irish Gaelic. The name praises not only his strength for killing the famous savage dog unarmed in his first battle and first time taking a life, but also for his character that thought of the owner of the lost dog even as a child.

He was still an apprentice warrior at the time, one in the training group for children wishing to become Knights of the Red Branch. He was around twelve or thirteen, though he claims it was just the adrenaline rush that allowed him to perform the feat. Honoring the noble declaration, he took up a geas that says he must never eat dog. It was prophesied that "this child will live as a hero" at a young age, and it could be said that he was predestined to become a hero due to his divine parentage.[2] After his name changed, the group of apprentices gathered around a druid, Cathbad, asking in an uproar which of them would become famed warriors.

Cathbad was powerful, with his divinations being strong enough to "determine the future" rather than simply "see the future." Not knowing how to handle the situation, he decided that he would tell it to only those who would take up arms on that day. The divination was bad enough that none of them attempted to go through the rites of warriorhood, though Cú Chulainn was fishing while leaning against a hazel tree due to his disinterest. He went through the rites of warriorhood on that same day, and received the prophecy that said "in exchange for glorious deeds of valor, his life would be short." He readily accepted such a fate, smiling and laughing.[2]

Land of ShadowsEdit


Scáthach's castle

King Conchobar was enraged at him for becoming a warrior at his young age, causing Cú Chulainn's temper to also flare up. He smashed the spears of the castle and wrecked a chariot, responding with "Now try telling me one more time that I'm not strong enough to be a warrior." He was accepted into the Red Branch, but he claims there was not much in the title. He could do as he wished as long as he was not disloyal, allowing him to pick a fight with another land and then have a party the same night and forget all about it. There were many people causing trouble within the knights, so he would keep any eye on his own country more often than others.

He was often fighting as a warrior, and he fell in love with a princess, Emer, the daughter of King Forgall Monach, at first sight. He was enamored enough that he went to her castle to kidnap her, but she complained about not wanting to be with some nameless child. Only sixteen at the time, he went on a journey in search of fame. He journeyed to the "Land of Shadows" upon hearing of a powerful sorceress named Scáthach who had many warriors searching to be her apprentices.[2][3] There were many warriors under her, and one, Ferdiad, a warrior of the neighboring country of Connacht, was his equal in competing for the demonic spear, Gáe Bolg.

They passed the vow of brotherhood, and though he has three priceless friends, Ferdiad held a special place in his heart as an older brother. With his incredible magic and unrivaled demonic spearmanship, he acquired the secrets of leaping, Gáe Bolg, and the original runes from her at the age of sixteen. She had said at the time he received the spear, "Perhaps, I wanted to be killed by your hands", while smiling with a serene voice like a prayer. She had been given a fate where even death was no longer in her hands. She then said, "I give up. Better die before that happens", laughing her same hearty laugh of which he had grown so fond.

Though he had arrived at the castle by the shortest route, she reflected, saying "If only you were born a little earlier... Young, still young... Sorry. Somehow, it seems I got sidetracked a lot." He could only plan to leave as a lone man lamenting the woman he loved. He stayed there for a long time, feeling at home with his teacher and good rival. Aífe, a lord of a neighboring country started a war with them, and in some versions of the legend, Scáthach's sister, and Scáthach did not allow him to take the battlefield. After arguing, he was eventually allowed to fight alongside them, and managed to capture Aífe after a duel.

While they were hated enemies, he realized that he found her appealing, so he pursued her and was beaten by Scáthach for it. They eventually parted ways, and he asked that if she bore his child to name him Connla and send him to Ulster. He was to be given three vows to follow: "To not answer his name when asked", "To not change course", and "To not back down from a fight", the worst possible rules that could be given to his son. He and Ferdiad left the Land of Shadows on the same day, and he did not see Scáthach when they left because she had passed down everything to him and had nothing more to tell him.

He and Ferdiad each asked "How about coming to my country?" as they left the castle, each laughing at the realization that neither would budge from their position. He returned to Ulster, starting dramatic battles and becoming known throughout Ireland in an instant. With exploits unrepeatable by anyone else, he came for the princess as promised. He was opposed by King Forgall and his troops, but he annihilated them and also achieved victory for Ulster's knights. These battles mark the youth of Cú Chulainn, and his subsequent battles bear a heavy shadow.

War with ConnachtEdit


The war with Connacht

The neighboring country of Connacht eventually took up arms against Ulster. Queen Medb, part of a long line of warmongering ruling queens, was the type of person who hated to give up, so she marched forces after a number of events transpired around her. She invaded irrationally simply to steal Donn Cuailnge, Ulster's golden bull, simply to beat her husband in a comparison contest. It started with Fergus defecting after the king had killed Fergus' sons out of lusting for young women. The pride of the Red Branch Knights began to serve Connacht out of hatred for Ulster's King, and that influenced Medb's aggressiveness.

There was also the factor of the curse affecting the people of Ulster that rendered men around the country too feeble to fight whenever they were invaded. Due to being born in a fairy mound rather than truly being born of Ulster, he was unaffected by the curse, allowing him to make part of his brilliant war record during the battles. He supported the weaker Ulster against her forces, an allied army of three countries. He spent every day slaying Medb's forces, and it eventually came to the point where they came to an agreement to change the war to a one-on-one fight as they began to lose.

Accepting several geas that would make him accept even his own ruin, one of which consisted of "fighting just one warrior a day", he forced the opposing country to take up geas unfavorable to them as well. It was set that they could only advance while he dueled one of their soldiers in the fords of the Ulster gorge. It was either lose five thousand men in one day, or only slightly advance at the cost of a single man, so Medb reluctantly agreed to it and started his series of duels. It began with Cú Chulainn's rune of vows, Ath nGabla, guaranteeing one-on-one combat with honor at stake.

Medb broke the conditions of the treaty and advanced. It was still a public vow, so it was only one unit that would not be noticed. It was still the best way of holding them back, but he had to deal with a number of issues. He had to fight a number of fine warriors and beings like the Calatin Clan monster, and he had to deal with other issues. He is ashamed that he had to sleep for an entire day due to fatigue at one point, so the training group of the Red Branch had to save him and was slaughtered because of it. He blamed himself for their deaths.

Morrigan, the goddess who governed death and destruction, also appeared before him to offer her protection. He declined and she was insulted, so she transformed into many animals to go after his life. He was able to repel every attack, and he even went as far as treating the wounded Morrigan. She came to admire that nobility from the bottom of her heart, deciding to support him without his knowledge. She did not want to destroy his pride, so she decided not to help him when he was in his greatest perils and simply observed the way of a hero.

The fords were a land of death, and the conclusion to the war was likely the greatest of living hells in his life. It eventually came down to the strongest of the warriors of Connacht, the one man he never wanted to fight, Ferdiad. Their battle was not of Ferdiad's own will, but rather a scheme laid down by Queen Medb. Both had to serve their lords, so one life had to be discard to defend honor far more worthless than their friendship. They were equal in battle, resulting in the cornered Cú Chulainn having to utilize Gáe Bolg to pierce the heart of the man he loved as a brother.

Taking Ferdiad's life was the first time the demonic spear had seen battle since leaving the Land of Shadows, and it was released on his most precious friend. Holding his fallen brother in his arms, Ferdiad said his final farewell to Cú Chulainn, "Gáe Bolg is a glory given to only the most gifted of warriors. In that brilliant hall of learning, you were our pride." The battle ended with the defeat of Connacht, allowing the recuperated warriors of Ulster to pursue their army and add a great blow to the defeat. He had managed to hold out against them for seven years, and finally succeeded in making them retreat.

Final daysEdit

Though he captured Medb, he returned her to Connacht, not killing her or shaming her, but instead treating her as a Queen. Though it was not something he had planned, he never once killed a lord or a woman. He did not like killing women on the battlefield, and loving or hating them made no difference.[3] There were no major battles after that point other than a strange young man coming down to the coast to stir up trouble. He beat any warrior who would speak to him, so the King declared that "Only Cú Chulain can beat this boy."

Other than before his own death, that event marked the only time his wife stopped him, crying that "you mustn't go." There was nothing he could do to avoid a royal order, so the two met in battle at the coast. He was a strong opponent that forced him to utilize Gáe Bolg. The warrior said "She didn't teach me that" before dying, revealing his tutelage under Scáthach. It was then that it was revealed that his name had been Connla, Cú Chulain's son. That marked the end of his golden years, as though he had become invincible, the sun still set for him.

Queen Medb had perceived her release as the greatest insult, vowing vengeance against him. As Celtic warriors had the custom of making geas, with those warriors who broke them being cursed, she utilized those of Cú Chulain against him.[3] She assembled warriors from the lands with grudges against him, and cornered him with many plots. He was forced to break his geas one by one, resulting in him losing his abilities. Ulster was once again beset by sickness, so he challenged the army of Medb single-handedly. Acting as the shield of Ulster and committing many deeds of valor, he had a life unexpectedly short in comparison to that valor.

He fell into scores of traps during the battle, and, battling furiously, he was eventually brutally killed and died pierced by his own magical spear.[2] He would not allow himself to die lying down, and tied himself to up to a post.[3] He saw an otter drinking the blood that had spilled into the river, and he died standing while laughing at its greediness. There landed a crow on the shoulder of his standing corpse in his death, said to have been the incarnation of Morrigan who continued to give him her unrequited love.[2] Poetry and statues praising Cú Chulainn still remain to this day in Ireland.


As a Caster, he does not put on any metallic equipment.[1]


Having manifested as a Caster, he apparently has imposed upon himself the role as one who guides. Not as a true druid, but as a temporary one, as long as he continues together with his master, he shall illuminate the path that the Master walks on.[1]


Fate/Grand OrderEdit

Fuyuki: Contaminated City in FlamesEdit

He appears in the "Burning pollution city Fuyuki singularity F". He assists the Ritsuka Fujimaru and Shielder, helping them defeat the other Servants serving under Artoria Alter and providing advice for them. After all of the other Servants are defeated, he also disappears, telling the Protagonist and Mash to summon him as a Lancer next time.

In the First Order movie, Chulainn had already defeated both Hassan of the Cursed Arm and Darius III, before meeting Ritsuka Fujimatu and Mash. He also battles EMIYA alone, managing to beat him in a close battle, and delivers the final attack to Artoria Alter with his Noble Phantasm, Wicker Man.

Boundary of Emptiness: Garden of OrderEdit


In his interlude Sage of the Forest, Cú Chulainn senses a distortion in a forest in Britannia, but Romani doesn't get any readings. After defeating werebeasts that appeared, Cú Chulainn speaks about his abilities that were given to him as a druid when he was summoned as Caster. The source of the distortion, the ghosts of druids, then appear, but they're soon destroyed by the group. With the distortion gone, Ritsuka asks Cú Chulainn if he wants to visit Ulster, but he refuses as he doesn't disturb them with his sudden return.


Having manifested as a Caster, he underwent a sudden change from when manifesting as a Lancer and now torments his opponents as a user of diverse Magecrafts. He has powerful heat・flame attacks as his specialty. Apparently, the "ansuz" rune is being employed in this.[1]

Chulainn's Noble Phantasms are Wicker Man and Ochd Deug Odin.

Rune Magic (A Rank): Possession of the Magic Crest of Northern Europe - the runes. By making proper use of this, powerful and varied effects are mastered. However, simultaneously employing multiple effects (joint use) is inadvisable.

Chulainn's other Skills are Territory Creation (B Rank), Protection from Arrows (A Rank), Divinity (B Rank) and Disengage (C Rank).


During Fate/stay night, it is noted that Cù Chulainn possesses the ability to be summoned into the Berserker and Caster classes, as well as his typical appearance as Lancer.

He is also known as the Prince of Light (Provisional Caster) (光の皇子(暫定キャスター), Hikari no Ōji (Zantei Kyasutā)?) in Fate/GUDAGUDA Order.

Mata is the character illustrator for the Caster version of Cú Chulainn.


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  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7
  3. 3.0 3.1 3.2 3.3 3.4 3.5