Sieg

Sieg (ジーク) is a major character in the Fate/Apocrypha novel.

Background
Sieg was created by Yggdmillennia as one of their many homunculi suited to various purposes. Initially kept in a magical energy supply tank devised by Gordes Musik Yggdmillennia to grant energy for Servants, he was one of many allowed to be used by Caster of Black for usage as harvesting materials for his golems. Due to his unexpectedly high quality Magic Circuits, he was thought to be a good choice for Caster's Golem Keter Malkuth.

Appearance
Like Einzbern Homunculi, he has the red eyes characteristic. However, his physical body is very fragile, like that of a new born baby. He wears a black waist coat, trousers and a white shirt.

After obtaining Saber of Black's heart, his physical appearance changes to that of Saber's. As this gains him a more mature and stable body which has a neutral bias, slender beauty to it with a handsome outlook.

Personality
Sieg comes into consciousness without anything to form a personality. He is scared of everything but himself, believing to be nothing. He calls himself transparent and colorless because he possesses nothing and had received nothing from his birth.

Fate/Apocrypha
Sieg, originally just an unnamed homunculus, first begins to gain sentience around the time the Black Faction has summoned all of its Servants. Originally, he is conscious without the ability to form thoughts, only a weak "instinct" protesting about a great pain. Without the ability to form thoughts or have recognition of anything, he cannot assert himself or clearly be called "alive." Simply by existing, he is able to receive "information", leading to "time" to process the information that eventually creates "knowledge" within him. He becomes conscious, and he is able to realize the simple fact that he is a living creature. The cycle of learning begins to repeat at a great speed, bolstered by his Magic Circuits. He recognizes many beings, including humans, homunculi, and Servants. The humans ignore him, the homunculi, his comrades, view him with faint emotions, and the Servants, monsters, display a wide variety of expressions.

There is no great change in his situation with the acquisition of knowledge, but he slowly begins to organize it within himself and begins to feel strange with the more information he obtains. Without realizing it to be fear in wanting to turn away from that which is in front of him, he cannot even understand it being an act of cowardice because he has yet to understand the idea of courage. After the scouting of Kairi Sisigou and Saber of Red leads to battle with several of Caster's golems, Caster and Roche Frain Yggdmillennia appear before Sieg, discussing the process of inserting Magic Circuits into the golems. Identifying them by their "codes", names, Sieg is able to recognize that they have appeared before him numerous times, and using his information, he is able to determine the insertion of Magic Circuits equates to the destruction of that which is consumed to supply them. Having not previously understood death, he becomes scared upon drawing the conclusion that destruction equals death.

As he is selected along with two others for Caster's usage, the part of him that had been scared clearly notes that he will soon die. Though he initially believes that there is no recourse, he decides to act due to being able to do what the other homunculi cannot, obtain information, think, and fear the conclusion. With the coincidence of obtaining an identity along with the coincidence of being chosen to die, his fate begins to move as he moves his arm for the first time in his life. Affirming his situation as he attempts to move, he makes both his hands move to beat against the reinforced glass. Realizing the futility in trying to break it physically, he scans his Magic Circuits to work a spell that weakens the glass enough for him to escape, breaking it and allowing him into the world from which he had been isolated. Injured from the glass, he removes his breathing apparatus and takes his first breath.

He quickly reminds himself that escape from the glass was only his initial goal, quickly seeking to escape. The ability to stand was not imbedded into his functions, so he can only fall and feebly craw along the floor. Slowly managing to stand, he is filled with great pain as he begins his first steps. He does not know his path, only knowing that he will die if he stays, and he can only walk forward with great trepidation of further pain as he ignores the "whispers" of the homunculi behind him. With skin as soft as that of a newborn, simply walking is enough to bloody his feet as he searches for a destination. Thinking himself to be a meaningless existence as his weak body struggles along, he can only believe that he will die without meaning in the same way he was born without meaning.

He pauses in confusion as he realizes Rider of Black has come before him, unable to move out of fear. Soothed by Rider's concern, he recognizes Rider and unconsciously mutters for Rider to help him before fainting. Before fading out, he only wishes that he will continue to be alive. Rider decides to help him, bringing him Archer of Black's room to hide him from Caster's pursuit. Archer realizes the situation, letting them in and preparing to look him over due to his expertise on medicine. He states that Sieg overused his circuits and tore through his veins in destroying the glass and further collapsed from exhaustion. He tells Rider of Sieg's physical condition and short lifespan, and Rider affirms that he will keep helping him until the end, as he would not be able to survive on his own.

Sieg awakens during their conversation, so he gets up at Rider's prodding. Extremely nervous, he is unable to understand Rider's meaning as he asks about helping to grant Sieg's wish. As he thinks about it, he believes a powerless being with no history has no right to have a wish in the first place, having given up such a right in the first place. Although he believes he does not deserve such a thing or that it will be granted, he asks Rider to save him. He is shocked when Rider agrees immediately, but becomes moved enough by Rider's innocence to have no doubt in his words.

He clashes with Saber of Red during a large battle. She calls him a fake Heroic Spirit, and he acknowledges that he cannot match up to a proper Heroic Spirit. In order to save his comrades who were left behind, he decides to utilize his Saber's Noble Phantasm, Balmung, clashing with her Clarent. He does not care about winning or losing, only that it is a necessary action. He who does not have a life in the first place cannot be said to be risking his life. Red Saber comes out victorious, but only due to the special properties of the weapons and the distance from which they attacked. It is possible utilizing Balmung even a few steps closer may have changed the outcome. She is infuriated because he still lives, and moves to finish him.

Fate/Labyrinth
Manaka Sajyou in her dimensional travel saw a superior and kind dragon (孤高なりし優しき竜), waiting for another for a very long time in the Backside of the World. Manaka finds the dragon's appearance to be beautiful, the dragon didn't respond Manaka and saw the end of the world.

Abilities
He possesses first-class Magic Circuits. Sieg is a being whose purpose was to have Magic Circuits as the foundation of his body, so his ability to comprehend information is great. He is able to go from being less aware than a baby to gaining knowledge at an abnormal speed in a span of days. He is made to take in mana from the atmosphere and provide it to Servants, and he is able to manually cut the link upon gaining intelligence. Instinctively knowing magecraft, he is able to use the spell "/" to wish for a result of "destruction" on the glass holding him, causing his magical energy to transform it in a way for the least "destruction" required. Able to understand the mineral the glass is constructed from, it becomes as brittle as a weak piece of wood. When Sieg tries to protect himself from Gordes, he uses this technique to defend himself. His palm became the barrel of a gun - the sheath of a sword - and what it fired was a bullet or perhaps blade that would not only destroy Gordes' arm, but mercilessly devour his heart.

Unlike regular homunculi built to be functional, perfect lifeforms, he possesses many physical defects, and while his circuits are first-class, his body is not able to utilize them without failing. Meant only to supply magical energy and not act as a fighter, he is physically weak and will only live three years at most.

After gaining Saber of Black's heart, his appearance physically changes and he gains a stronger constitution which leads Rider of Black to claim he can live for more than 100 years. He has special black Command Seals which appeared on the back of Sieg's left hand known as Dead Count Shapeshifter: Dragon Revelation Command Spells which allows him to take the form of the Heroic Spirit Siegfried for 180 seconds (3 minutes). He can only take form using the Command Spell for a limit of three uses.

His parameters, experience, technique, personal skills, Noble Phantasms all are replicated perfectly but he cannot match a true Heroic Spirit. His usage of Balmung does not appear impeded by this. He requires adequate magical energy stored in his body and the use of a Command Spell to take on Saber's form.

Using Balmung is enough to deplete his reserves completely, causing him to lose Saber's form even as his magic circuits desperately cling to "remain as Saber." His armor and Noble Phantasm disappear, causing Saber of Black to vanish from the world. The process brings extreme pain to his flesh, bones, and nerves, and he loses any ability to move or retaliate. It is possible to transform again, but his body cannot endure to do so consecutively.

After getting revived by Frankenstein's lightening imbued by her will a piece of her is reborn inside him. Later granting him the perpetual motion machine ability of Galvanism, Bridal Chest, and a weakened version of Blasted Tree to use against Shirou in their final fight.

Also displaying the ability to transform into the dragon Fafnir due to him having Siegfried's heart giving him dragon blood as he used this to carry the Greater Grail to the otherside of the world where phantasmal beasts go where no human can venture.

Creation and Conception
Yuuichirou Higashide said that everything started from him. When he was discussing wild ideas with Kinoko Nasu, Higashide said "his Chest will glitter brightly, three full times!", to which he found it too stupid so he removed it when he was writing the story.