Morgan was born as the proper, recognized daughter of King Uther. Although the older sister and of the same status, Artoria received the love and hopes of their father in Morgan's eyes, driving her to eventually become a witch queen who craved for vengeance for the rest of her days. Once Camelot was built, she went into seclusion. She sent Agravain as an assassin. She was a fairy of the lake and the evil polar opposite of Vivian, the Lady of the Lake.
She eventually enchanted Artoria, a pseudo-male at the time due to Merlin's intervention to produce an heir, and extracted sperm from Artoria to develop as a homunculus clone within her ovary. Mordred was soon born and aged rapidly, and Morgan raised her in secret while telling her of her right to the throne. She told Mordred to never remove her helmet and recommended her to the Round Table. She directed Mordred to hide her status and obey the King until she could defeat Artoria and take her place. While Mordred was initially idealistic and served as a proper knight, Morgan shattered her innocence with the truth of her birth to guide her towards the path of rebellion.
Morgan is a young woman with long blonde hair coupled by a crown and a veil covering her face. She seemingly wore a black dress that exposes her navel and abdomen
Morgan greatly hates her sister and possesses a great obsession for Mordred to take the throne from her. She changed greatly throughout her life from a "fine lady" to a "frightening thing" according to Kay, and he describes it as if she had three women inside of her. Having started with the "innocence of a fairy", she became "as magnificent as a warrior maiden", and "then suddenly possessed the brutality of a witch." Kay believes she may have had similar burdening circumstances as Artoria due to their parentage.
Morgan makes a brief appearance in the manga version of the series.
Garden of Avalon
Morgan is mentioned in Kay's story and Lancelot's story.
Morgan is reflected in the form of Excalibur should the user become tainted with evil, becoming Excalibur Morgan. Mordred mentions in Fate/Apocrypha that Semiramis, an evil schemer, possesses the same "smell" as Morgan. In the anime adaptation of Fate/Apocrypha, she makes an appearance in the dream of Kairi Sisigou, showing how she was involved in Mordred's past.
Morgan is a powerful witch queen said to be the equal of Merlin and a ruler with immense power. Although unexpected, Morgan was born with supernatural blood that was thought to have died with King Uther. She also inherited from King Uther the primeval curse that lurks in the British Isles in the form of blackened magical energy of the same kind of Excalibur Morgan's. She was the legitimate owner of the British Isle, a greater "King of the Island" than her sister. Despite that, she proved to be nothing more than a "small pebble" on the path of Artoria, unable to do anything to injure Artoria's heart. Morgan possesses the ability to enchant Artoria and create the homunculus clone Mordred.
- ↑ 1.0 1.1 1.2 1.3 1.4 Garden of Avalon
- ↑ 2.0 2.1
 Fate/complete material III: World Material - The Servants of the Fifth Holy Grail War:
Blackening of Servants, p.038 [T]
Blackening of Servants
The black mud in the Holy Grail contaminates the souls of those who touch it. It goes without saying for mere humans, and supernatural beings like Servants are no exception to this either. The contaminated person's personality reverses toward the orientation of evil. This is madness caused by touching Angra Mainyu. This is called "blackening". There are those who can use the black mud as part of their own power thanks to the properties of its contamination and those whose powerful egos have stayed back its mental pollution.
An example of the former is Matou Sakura and the latter is Gilgamesh. The blackened Servant is incarnated by the power of the Grail so the more concrete ties to the physical plane turns them into powerful beings.
Their physical interference power increases but at the same time they lose the ability to return to spirit form.
Also, as they no longer bother to restrain their magic energy consumption, their fighting ability jumps significantly. This momentum can be compared to a runaway train.
Because they are in that state, fine control is not possible, but in exchange, their destructive power increases.
They are fearful beings inflicting havoc and death upon the world. These are blackened Servants.
Master: Matou Sakura
Alignment: Lawful Evil
Noble Phantasm: A++
Saber Alternative, or Black Saber, is the name given to Artoria when she fell to Hassan, was consumed by the dark shadow, and obtained true incarnation during the "Heaven's Feel" route.
Artoria, now jet-black, could now invoke Excalibur without limit thanks to the enormous prana supply from the blackened Sakura. Thus, she could overwhelm Berserker Heracles even in a direct battle. Now unfettered and in a sense more powerful than she was in life, none can deny that she is the strongest Servant.
Magic Resistance: B
Lower than original value due to the corruption. Still high, as it nullifies spells at B rank (activated within three counts) or lower, and it is difficult to harm her even with high thaumaturgy.
In the maddened state while blackened, the loss of fine control makes it impossible to ride beasts; rather, the mount cannot withstand it. Therefore, in reality one can consider the Riding ability lost.
Constant self-control is required to maintain Saber's reason while blackened. To focus on suppressing her madness, her surroundings are neglected and Instinct is dulled.
Power Burst: A
Saber's body is always suffused in the energy supplied by the Greater Grail. Her armor is also reinforced, granting more defensive ability than in her original state.
The magnificent king's charm which once inspired and captivated her soldiers is gone. Since she rules by terror, leadership ability is improved but troops' morale is extremely low.
Sword of Promised Victory -- Excalibur
Type: Anti-fortress Noble Phantasm
Maximum targets: 1000 persons
Even while blackened, Artoria's greatest power Excalibur is still potent. However, the sword is tainted an ominous black. Just as the fairies of the lake (Vivienne and Morgan) manifest as both good and evil, the holy sword has its own dark side. Still, its "character" as a holy sword is greatest. The function of converting the wielder's magical energy into light through the blade does not change, but the light is transformed into the same darkness of the blade.
- ↑ 3.0 3.1
 Character material - Mordred, p.042-043
Note: All references to gender are neutral in the original text.
Introduction - Mordred
"You must never remove that helmet."
The child of Artoria's sister, Morgan.
A masked knight that came to Camelot with only the recommendation of Morgan and by presenting his awesome swordsmanship became one of the knights of the round table. He was given his sword despite his unknown origins because of his abilities and his straightforward mental chivalry.
In Fate, actually a clone created by Morgan from Artoria. A homunculus, but also a rather complete son of Artoria. Morgan used sorcery to enchant Artoria, who had become a pseudo male, extracted sperm and developed it in her own ovary.
"My son, you have the right to inherit the throne, but for now, hide your status and obey the King. And one day....you will defeat the King and take his place." He bore that obsession of his mother, but before that ambition, was Mordred's adoration of King Arthur.
Being a homunculus, his speed of growth was faster than a human being, and his life span far shorter. Feeling shame at his twisted birth, he was unconsciously jealous of normal people and due to the special innocence that children have, worshiped King Arthur, the "perfect king".
While hiding his dislike of others, he protected the way of the knights in such a way that could only be found in picture books and worked hard daily in being the ideal knight.
But, even that innocence was shattered by Morgan.
Not having the slightest feelings of rebellion on him, he was spurred on by Morgan who told him the truth of his birth.
That Mordred was a child born between Artoria and Morgan.
That King Arthur didn't know that Mordred was his own child and that even if he did, he would never accept such a filthy child.
While shocked by this, he was at the same time wrapped in joy.
Despite not being a proper human, he was a child having the same blood as the King. No, as the son of a king that was superior, he should be proud of the fact that he was not human. In name, reality, mind, and body, he was fit to be the successor of the King.
Mordred approached the King with delight. This was because to Mordred, who had no father, King Arthur was the very form of godlike "father".
However, Artoria rejected Mordred very clearly.
"I see. Even if you were born my sister's plotting, you were certainly born from me. However, I will not recognize you as my son nor will I give you the throne."
Arthur hated his sister Morgan. How could the son of that person be accepted.
"It makes sense.... I finally understand why my title was the weakest."
Despite how hard he tries. Even if he excels over anyone, the moment he was born from Morgan, the King would look down on him as a forever as a dirtied child.
Because of the love he had up until then had been so great, the hate of the rejected Mordred burned.
As a result, the distrust of the Round Table towards King Arthur spread and the reigns of power of Camelot were seized once Arthur departed for the Rome expedition.
He would become the leader of the rebellion representing the national discontent towards King Arthur, after finally returning after a long and tiresome battle.
Mordred raged, claiming that he hated King Arthur, that he was fit for the throne, but the truth was that he only wanted to be accepted by Artoria. He only wanted to be called "son" by the King.
The final fight.
With both armies dying, the two faced each other on a hill of swords.
"Look around you King Arthur. Your country has ended. Which ever one of us emerges the victor, it matters not. As you see before you, everything is gone. You should have known it would come to this. Had you given to me the crown, this would not have happened. Did you hate me, the son of Morgan, that much?!"
King Arthur emotionlessly replied back.
"Not once did I despise you.
There was only one reason I would not give you the throne.
You didn't have the capacity of a King."
Mordred ran forward, driven on by passion.
Defeated in single combat, Mordred collapsed while still impaled by a spear.
"Never remove it before other people."
Freed from that mask his mother forced on him, and with a face identical to Artoria exposed, he said,
He reached out to touch the King with his blood-soaked hands at least once, but not even that wish was granted as he fell.
- ↑ 4.0 4.1 Fate/Apocrypha - Volume 1
- ↑ Fate/Grand Order material I - CHARACTER profile: Altria Pendragon (Alter), p.028-035