Appearance:

This servant has many possibles appearances, but it will mostly be average looking adults westerners and they will always wear 1st world war military uniforms from the allied nations.
Pseudo True Name : The Unknown Soldier
Class: Archer
Gender: Mostly men, but there are some women.
Era: World War 1
Alignment: Variable, but Lawful is the most common trait.
Attribute: Man
History
Many died in the world war. In respect to those who gave their lives for their countries, many monuments were created to remember their names. You can find them in city, towns and villages of Europe, listing the names of their local heroes.
But there also was those whose names were lost. Did they have no relative who could remember them? Where they disfigured beyond recognition? Where they lost in foreign lands, their bodies never recovered?
Monuments were built for them too. In many countries, you can find a tomb dedicated to these Unknown Soldiers, lost to history.
To reach the throne of heroes, one must inscribe their names onto history itself. But the Unknown Soldier is the concept that assemble all of these lost warring souls from the war that should have ended all wars. It is a concept that denies True Names.
And so, they find themselves fighting another war, in the quest of the wish-granting Holy Grail.
Personality
The unknown soldier encompass a large number of peoples. They are of course all unique individuals, but they also were united in their roles as soldiers. They have all been trained to military discipline but their reasons for joining their respectives armies vary greatly, from strong patriotism to the circumstances forcing their hands.
An important aspect to them (which they will try to hide as much as possible), is that while the Unknown Soldier is a Heroic Spirit, they are not. As none of them left their names into history, the Throne of Heroes is inaccessible to them. This notably means that this servant does not have an actual True Name. The concept of the Unknown Soldier being inscribed into the throne is what is summoned as a servant while the souls of the lost soldiers are brought to fill the class vessel, since this concept is too lacking on its own to form a servant. So in practice, this is a servant which is more of a collection of wraiths than an actual Heroic Spirit. As a result, they bear some level of curses within them.
They are somewhat ashamed of this status as they are meant to face true heroes who properly left their mark on history. But they are determined to obtain the Holy Grail, especially since their unconventional nature as servant and weakness due to their modernity makes them unlikely to be summoned in the first place.
This means they intend to do everything in their power to win the Holy Grail War. Most of them have enough morals to not commit blatant war crimes but they have no interest in glory and honor and will always approach their fights with a pragmatic strategy.
This means that while they admire heroes, they scorn those who fight for glory. After all, the nameless soldiers are the firsts victims of glory seekers. Similarly, those who treat fighting unseriously or do not value life will gain the Unknown Soldier's hatred.
Finally, all rulers but Kings in particular are a touchy subject for the Unknown Soldier. That is because of their background, of why they entered the first world war. Because of this, they are very divided. Some are patriots, others feel betrayed by their countries. And the subject of royalty in particular was still the source of many debates in their era. France had been a Republic for only a bit over 40 years. Britain never stopped being a kingdom. Italy was still one. And there are both Americans and Russians soldiers among them as both countries were part of the allies in their own times. And this is only to speak of the most common nationalities.
They apply the same judgement to their master. The Unknown Soldier will obey faithfully someone worthy of their respect, but they will ignore or even scorn one who does not fit their standards. In this case, they will act on their own and chose how to fight based only on their own experience and observations.
Of course, they are full of regrets. The wish they ended up convening to is to slightly alter history so that their names were never forgotten. Doing this would end the concept of the Unknown Soldier.
Whenever they differ on a subject, they will mentally argue with each other to determine their answer. The process is rather fast but can last awhile if they have trouble agreeing together.
Parameters
(Dependent on the individual)
Strength: E to D+
Endurance: E to D+
Agility: E to D+
Mana: E-
Luck: E- to B
Class Skills
Magic Resistance E : While they possess this skill thanks to their class, their nature as modern human with no experience of magecraft battles makes it basically defunct. In practice, the Unknown Soldier does not benefit from any protection against any magecraft.
Independent Action B : Their low cost as a servant as well as the concept of a Lost Soldier makes them capable of lasting for up to two days without magical energy support. However, using Selective Deployment to its fullest can dramatically decrease this time.
Personal Skills
Selective Deployment A : The Unknown Soldier has access to 204 different souls and each of them can manifest with a separate spiritual body, spirit origin and spiritual core. Of course, to do so is extremely costly in magical energy so they will restrain their manifestations if there is no need for additional firepower. The minimum number of manifestations is one, as they need at least one spirit origin as Proof of Existence. If the only or last remaining manifested soldier is killed, another one is automatically manifested in their place. This means that it is necessary to kill each and every single one of them to kill the Unknown Soldier, but also that it's possible to kill them in chain by repeatedly hitting mortal blows if there is only one remaining manifested soldier.
The downside of this large number is that they are very weak. A good mage with access to strong destructive magecraft can potentially take them down.
The average mage (Magic circuits rank C) can at best manage to supply about 60 soldiers without using their own spells or the Unknown Soldier’s Noble Phantasm. Only the most impressive of mages may hope to support all of them at once. Independent Action can help to support the cost, but using it in that way during a fight will quickly use up its reserve of energy.
Range: 1-5 (any manifested soldier can serve as the point of reference from which another one is manifested)
Grudges D++ : Basic wraith curses. Potentially strong thanks to their numbers but lacking in subtlety or control. They usually keep them hidden to not reveal their true nature. If possible, they would rather not use them at all. However, since these are the manifestation of their grudges, regrets and resentments, losing control of their emotions could easily means losing control of the curses too.
This is technically a wraith skill rather than that of a servant. Due to this, the defeat of the Unknown Soldier does not fully purge those curses. Some of the wraiths themselves might remain, though such weak spirits are not threat to a servant in decent condition, even a capable enough mage could take care of them.
Those traits are not of much importance in the Holy Grail War, which commonly sees much greater power. Something that does matter however, is that such a servant is improper food to a Holy Grail. This is also a reason why they hide their nature.
Noble Phantasms
First World War Weaponry
Rank: C++
NP Type: Anti-Unit and Utility
Range: 0-2
Maximum Number of Targets: 1 (the user of the Noble Phantasm)
Description: Unknown Soldier's Noble Phantasm. Function in a similar manner to Item Creation. It gives the Unknown Soldier access to all the weaponry they collectively used in their lifetimes. This also includes supplies and tools as long as they are considered military stock. Examples includes rations, medical kits, vehicles and more. The strongest tools they have is a few WW1 tanks.
Of course, since it is a Noble Phantasm, those weapons are effective against Heroic Spirits. But their modernity greatly diminishes their power against strong magic defenses or Noble Phantasms.
The World War to end All
Title: Myriad memories of final moments
Rank: EX
NP Type: Anti-Army
Range: 30 (cannot be reduced, center of the user, targets everyone in its range indiscriminately
Maximum Number of Targets: ~300
Activation conditions: It requires both a chant including the true name release and a processus called “Cursed energy transmutation”.
“We died for the world
We died alone
We died with no one to remember us
Whoever you are, witness us
Witness the pain, terror and oblivion
Witness The World War to end All”
Performing the chant allows to start the Cursed energy transmutation. It uses the curses contained within the Unknown Soldier as the spark to ignite all its remaining magical energy along with their spiritual bodies, transforming it into curses. This is necessary due to The World War to end All being a wraith’s Noble Phantasm. This means it can only be powered by curses.
As a consequence, if for one reason or another the Unknown Soldier ends up purified from their curses earlier, it will impede on their ability to use this Noble Phantasm. Similarly, as their curses are fueled by negative emotions, they need to channel those for the chant to be effective in the first place.
Description: It creates a unique bounded field, something somewhere between a Reality Marble and the haunted places that wraiths utilize. While the rank of the Noble Phantasm as a whole is EX, this bounded field is rank B++, gaining in effienciency based on how much grudge the Unknown Soldier holds toward the target. One with a powerful Magic Resistence could be protected from its effect. It is also an extremely advanced form of possession, so skills against those are also effective.
It pulls the consciousness of its captives within a separate layer of reality within which a vast hellish battlefield serves as the theater for the patchwork memories of the soldiers’ final moments. It is filled with puppets which perfectly imitates humans who will recreate these scenes. The remaining soldiers themselves lose their servants bodies as they are consumed in the making of The World War to end All and their spirits are made to inhabit puppets of themselves.
Similarly, the captured consciousnesses are transferred into cursed puppets which mirror their bodies. The curse connects all damage to inflict it upon the original body, including mortal wounds. This means that dying within this separate layer of reality cause death to the true body unless it is capable of surviving damage that the puppet can’t.
The puppet bodies are inscribed with the concept of “humans from a world without mystics”. So, they do not possess functional magic circuits, meaning magecraft doesn't work. Demigods are also stripped of their divinity. Servants will lose the benefits of their class vessel as they will be restrained to human limits. Any skill or ability obtained outside of mystics will still work fine as neither training nor knowledge are affected. Physical items are also only replicated superficially, so a sacred sword will function as a normal one for example. If a servant had a weapon or other construct in spirit form when were pulled into the bounded field, it will be brought along as well. Beasts are treated more like items than people since the Unknown Soldier does not think of animals as proper witnesses.
The deaths recreation will start immediately and multiple of them will occur at the same time. The curse will end on its own once all remaining soldiers have met their ends. In the hypothetical event where all 204 soldiers are still present, it could take around half an hour. The less of them were left to activate the Noble Phantasm, the shorter it will be. It can be further shortened by killing them directly, but it is not necessary to participate in any fighting. The extra puppets on the side of the Allies will see the captives as either comrade of arms or civilian to protect (depending on one’s martial prowess) while those on the side of the Central Powers will see them as enemy soldiers or targets to capture (based on the same reasoning).
As for the wraiths, they will be initially in a sort of trance, perfectly reacting their final moments. Any interruption could pull them out of it, but they still won't be able to prevent or delay the events which led to their ends.
From the outside, the captives will appear asleep. Only those present at the moment of activation are captured, so it is possible to approach the scene afterward and interact with their bodies. Moving the bodies away from where the bounded field was cast does not cancel the effect. However, as this is effectively a form of possession strongly ranked up, a powerful form of exorcism may potentially free the captives early.
If one can, through any means necessary, be it social skills, sneaking, athletics or anything, survive to the end, their consciousness will be automatically brought back to their original bodies.
This Noble Phantasm is the crystallization of the wraiths’ corrupted desire to share their experiences with others and be remembered. However, as it recreates their deaths, this will end them once more. Furthermore, their cursed aspects make it dangerous to all others involved.
This contradiction, as well as the fact that using this Noble Phantasm means giving up on winning the current Holy Grail War, makes them extremely unlikely to consider using The World War to end All.
They still possess this ability without their class vessel, but it is ranked down to E. At this level, it is incapable of making use of the separate layer of reality, so this is nothing more than a nightmare. The only damage it causes is mental.

This servant has many possibles appearances, but it will mostly be average looking adults westerners and they will always wear 1st world war military uniforms from the allied nations.
Pseudo True Name : The Unknown Soldier
Class: Archer
Gender: Mostly men, but there are some women.
Era: World War 1
Alignment: Variable, but Lawful is the most common trait.
Attribute: Man
History
Many died in the world war. In respect to those who gave their lives for their countries, many monuments were created to remember their names. You can find them in city, towns and villages of Europe, listing the names of their local heroes.
But there also was those whose names were lost. Did they have no relative who could remember them? Where they disfigured beyond recognition? Where they lost in foreign lands, their bodies never recovered?
Monuments were built for them too. In many countries, you can find a tomb dedicated to these Unknown Soldiers, lost to history.
To reach the throne of heroes, one must inscribe their names onto history itself. But the Unknown Soldier is the concept that assemble all of these lost warring souls from the war that should have ended all wars. It is a concept that denies True Names.
And so, they find themselves fighting another war, in the quest of the wish-granting Holy Grail.
Personality
The unknown soldier encompass a large number of peoples. They are of course all unique individuals, but they also were united in their roles as soldiers. They have all been trained to military discipline but their reasons for joining their respectives armies vary greatly, from strong patriotism to the circumstances forcing their hands.
An important aspect to them (which they will try to hide as much as possible), is that while the Unknown Soldier is a Heroic Spirit, they are not. As none of them left their names into history, the Throne of Heroes is inaccessible to them. This notably means that this servant does not have an actual True Name. The concept of the Unknown Soldier being inscribed into the throne is what is summoned as a servant while the souls of the lost soldiers are brought to fill the class vessel, since this concept is too lacking on its own to form a servant. So in practice, this is a servant which is more of a collection of wraiths than an actual Heroic Spirit. As a result, they bear some level of curses within them.
They are somewhat ashamed of this status as they are meant to face true heroes who properly left their mark on history. But they are determined to obtain the Holy Grail, especially since their unconventional nature as servant and weakness due to their modernity makes them unlikely to be summoned in the first place.
This means they intend to do everything in their power to win the Holy Grail War. Most of them have enough morals to not commit blatant war crimes but they have no interest in glory and honor and will always approach their fights with a pragmatic strategy.
This means that while they admire heroes, they scorn those who fight for glory. After all, the nameless soldiers are the firsts victims of glory seekers. Similarly, those who treat fighting unseriously or do not value life will gain the Unknown Soldier's hatred.
Finally, all rulers but Kings in particular are a touchy subject for the Unknown Soldier. That is because of their background, of why they entered the first world war. Because of this, they are very divided. Some are patriots, others feel betrayed by their countries. And the subject of royalty in particular was still the source of many debates in their era. France had been a Republic for only a bit over 40 years. Britain never stopped being a kingdom. Italy was still one. And there are both Americans and Russians soldiers among them as both countries were part of the allies in their own times. And this is only to speak of the most common nationalities.
They apply the same judgement to their master. The Unknown Soldier will obey faithfully someone worthy of their respect, but they will ignore or even scorn one who does not fit their standards. In this case, they will act on their own and chose how to fight based only on their own experience and observations.
Of course, they are full of regrets. The wish they ended up convening to is to slightly alter history so that their names were never forgotten. Doing this would end the concept of the Unknown Soldier.
Whenever they differ on a subject, they will mentally argue with each other to determine their answer. The process is rather fast but can last awhile if they have trouble agreeing together.
Parameters
(Dependent on the individual)
Strength: E to D+
Endurance: E to D+
Agility: E to D+
Mana: E-
Luck: E- to B
Class Skills
Magic Resistance E : While they possess this skill thanks to their class, their nature as modern human with no experience of magecraft battles makes it basically defunct. In practice, the Unknown Soldier does not benefit from any protection against any magecraft.
Independent Action B : Their low cost as a servant as well as the concept of a Lost Soldier makes them capable of lasting for up to two days without magical energy support. However, using Selective Deployment to its fullest can dramatically decrease this time.
Personal Skills
Selective Deployment A : The Unknown Soldier has access to 204 different souls and each of them can manifest with a separate spiritual body, spirit origin and spiritual core. Of course, to do so is extremely costly in magical energy so they will restrain their manifestations if there is no need for additional firepower. The minimum number of manifestations is one, as they need at least one spirit origin as Proof of Existence. If the only or last remaining manifested soldier is killed, another one is automatically manifested in their place. This means that it is necessary to kill each and every single one of them to kill the Unknown Soldier, but also that it's possible to kill them in chain by repeatedly hitting mortal blows if there is only one remaining manifested soldier.
The downside of this large number is that they are very weak. A good mage with access to strong destructive magecraft can potentially take them down.
The average mage (Magic circuits rank C) can at best manage to supply about 60 soldiers without using their own spells or the Unknown Soldier’s Noble Phantasm. Only the most impressive of mages may hope to support all of them at once. Independent Action can help to support the cost, but using it in that way during a fight will quickly use up its reserve of energy.
Range: 1-5 (any manifested soldier can serve as the point of reference from which another one is manifested)
Grudges D++ : Basic wraith curses. Potentially strong thanks to their numbers but lacking in subtlety or control. They usually keep them hidden to not reveal their true nature. If possible, they would rather not use them at all. However, since these are the manifestation of their grudges, regrets and resentments, losing control of their emotions could easily means losing control of the curses too.
This is technically a wraith skill rather than that of a servant. Due to this, the defeat of the Unknown Soldier does not fully purge those curses. Some of the wraiths themselves might remain, though such weak spirits are not threat to a servant in decent condition, even a capable enough mage could take care of them.
Those traits are not of much importance in the Holy Grail War, which commonly sees much greater power. Something that does matter however, is that such a servant is improper food to a Holy Grail. This is also a reason why they hide their nature.
Noble Phantasms
First World War Weaponry
Rank: C++
NP Type: Anti-Unit and Utility
Range: 0-2
Maximum Number of Targets: 1 (the user of the Noble Phantasm)
Description: Unknown Soldier's Noble Phantasm. Function in a similar manner to Item Creation. It gives the Unknown Soldier access to all the weaponry they collectively used in their lifetimes. This also includes supplies and tools as long as they are considered military stock. Examples includes rations, medical kits, vehicles and more. The strongest tools they have is a few WW1 tanks.
Of course, since it is a Noble Phantasm, those weapons are effective against Heroic Spirits. But their modernity greatly diminishes their power against strong magic defenses or Noble Phantasms.
The World War to end All
Title: Myriad memories of final moments
Rank: EX
NP Type: Anti-Army
Range: 30 (cannot be reduced, center of the user, targets everyone in its range indiscriminately
Maximum Number of Targets: ~300
Activation conditions: It requires both a chant including the true name release and a processus called “Cursed energy transmutation”.
“We died for the world
We died alone
We died with no one to remember us
Whoever you are, witness us
Witness the pain, terror and oblivion
Witness The World War to end All”
Performing the chant allows to start the Cursed energy transmutation. It uses the curses contained within the Unknown Soldier as the spark to ignite all its remaining magical energy along with their spiritual bodies, transforming it into curses. This is necessary due to The World War to end All being a wraith’s Noble Phantasm. This means it can only be powered by curses.
As a consequence, if for one reason or another the Unknown Soldier ends up purified from their curses earlier, it will impede on their ability to use this Noble Phantasm. Similarly, as their curses are fueled by negative emotions, they need to channel those for the chant to be effective in the first place.
Description: It creates a unique bounded field, something somewhere between a Reality Marble and the haunted places that wraiths utilize. While the rank of the Noble Phantasm as a whole is EX, this bounded field is rank B++, gaining in effienciency based on how much grudge the Unknown Soldier holds toward the target. One with a powerful Magic Resistence could be protected from its effect. It is also an extremely advanced form of possession, so skills against those are also effective.
It pulls the consciousness of its captives within a separate layer of reality within which a vast hellish battlefield serves as the theater for the patchwork memories of the soldiers’ final moments. It is filled with puppets which perfectly imitates humans who will recreate these scenes. The remaining soldiers themselves lose their servants bodies as they are consumed in the making of The World War to end All and their spirits are made to inhabit puppets of themselves.
Similarly, the captured consciousnesses are transferred into cursed puppets which mirror their bodies. The curse connects all damage to inflict it upon the original body, including mortal wounds. This means that dying within this separate layer of reality cause death to the true body unless it is capable of surviving damage that the puppet can’t.
The puppet bodies are inscribed with the concept of “humans from a world without mystics”. So, they do not possess functional magic circuits, meaning magecraft doesn't work. Demigods are also stripped of their divinity. Servants will lose the benefits of their class vessel as they will be restrained to human limits. Any skill or ability obtained outside of mystics will still work fine as neither training nor knowledge are affected. Physical items are also only replicated superficially, so a sacred sword will function as a normal one for example. If a servant had a weapon or other construct in spirit form when were pulled into the bounded field, it will be brought along as well. Beasts are treated more like items than people since the Unknown Soldier does not think of animals as proper witnesses.
The deaths recreation will start immediately and multiple of them will occur at the same time. The curse will end on its own once all remaining soldiers have met their ends. In the hypothetical event where all 204 soldiers are still present, it could take around half an hour. The less of them were left to activate the Noble Phantasm, the shorter it will be. It can be further shortened by killing them directly, but it is not necessary to participate in any fighting. The extra puppets on the side of the Allies will see the captives as either comrade of arms or civilian to protect (depending on one’s martial prowess) while those on the side of the Central Powers will see them as enemy soldiers or targets to capture (based on the same reasoning).
As for the wraiths, they will be initially in a sort of trance, perfectly reacting their final moments. Any interruption could pull them out of it, but they still won't be able to prevent or delay the events which led to their ends.
From the outside, the captives will appear asleep. Only those present at the moment of activation are captured, so it is possible to approach the scene afterward and interact with their bodies. Moving the bodies away from where the bounded field was cast does not cancel the effect. However, as this is effectively a form of possession strongly ranked up, a powerful form of exorcism may potentially free the captives early.
If one can, through any means necessary, be it social skills, sneaking, athletics or anything, survive to the end, their consciousness will be automatically brought back to their original bodies.
This Noble Phantasm is the crystallization of the wraiths’ corrupted desire to share their experiences with others and be remembered. However, as it recreates their deaths, this will end them once more. Furthermore, their cursed aspects make it dangerous to all others involved.
This contradiction, as well as the fact that using this Noble Phantasm means giving up on winning the current Holy Grail War, makes them extremely unlikely to consider using The World War to end All.
They still possess this ability without their class vessel, but it is ranked down to E. At this level, it is incapable of making use of the separate layer of reality, so this is nothing more than a nightmare. The only damage it causes is mental.
Currently editing, this is a work in progress.