Gate of Babylon

Gate of Babylon: King's Treasure is the "Golden Capital" that is the "King's Treasury" of Gilgamesh, and moreover, the golden key connected to it. It is the storehouse Gilgamesh built to store all the treasures in the world he has collected, referred to as the "Divine Gate". It connects the space of reality to the vault, opening an "invisible door" that allows for the contents to pass through upon the user's command. Allowing for easy access to the items of the treasury, he is able to pick and utilize them as he pleases. The rank of the Noble Phantasm changes from "E~A++" due to it reflecting the ranks of the contents of the treasury. It is a Noble Phantasm that becomes more powerful with the user's wealth, but it also would not be a useful Noble Phantasm without a wealth of valuables. It is also once referred to as an EX ranked Noble Phantasm by Tokiomi Tohsaka due to containing Ea. The items that pass through the gate form glowing ripples in the empty air as they appear. He can summon items directly into his hand, pull out weapons from directly behind him, or prepare numerous weapons in the air, loaded like bullets. This Noble Phantasm is named as such because Babylon has become synonymous with the "Capital of Sin" and the "Golden Capital". There are probably imitations like the Road of Babylon (ロード·オブ·バビロン) as well.

Although he possessed the treasury in life, he never thought about utilizing the treasures as projectiles until his first battle with Enkidu. Forced to draw out the treasures he had carefully stored away was initially humiliating for him, but eventually came to enjoy it and brought them out without regret. He later commented that his treasury was in disarray since meeting Enkidu, calling it a "harebrained habit" that Enkidu instilled upon him. Its usage is why Gilgamesh is of the Archer class, firing the Noble Phantasms like bullets to make him the Archer with the strongest arrows. While most Servants view their Noble Phantasms as treasured possessions, Gilgamesh freely launches them with the same carelessness as throwing a handful of stones. Producing an excellent ratio of destructive power to magical energy efficiency, the real cost is not within the Noble Phantasms acting as bullets but rather the mere activation cost of the Gate of Babylon. Compared to Heracles, the indomitable "ultimate expression of human perseverance", the treasury is the exact opposite as the infinite "ultimate expression of overwhelming force." He can ready numerous weapons, letting their hilts stick out when he is waiting and instantly showing the blades when about to fight. They move and take aim at the target according to Gilgamesh's will, allowing him to fire without having to even touch them.

Gilgamesh can send out as little as one or two weapons or enough at a single time that it becomes comparable to a torrent of "gushing water" directed at the opponent. He will increase the amount depending on the situation, opening the Gate wider to reflect his anger or when forced to become more serious. He will generally use weak treasures unless the situation should call for his highest class of treasures, such as in the case of Heracles' God Hand. He can prepare and launch dozens, hundreds, and even thousands if he is serious. Possessing an inexhaustible supply, he can fight multiple battles without a single repeat Noble Phantasm being witnessed. Upon firing them, he can allow them to pierce the ground after striking the target, causing a large amount of destruction with each weapon that is comparable to something being blown up by an explosive blast, or he can instantly return them to the vault before they hit the ground at such a speed that they appear to have been illusionary. He utilizes a Noble Phantasm to retrieve any weapons left on the battlefield, instantly dissipating and returning them to the vault. He can also leave them out if he wishes, such as when they have been "stained" by striking Caster's summoned creature.

Upon snapping his fingers or without even a gesture, the weapons can be continuously launched at the opponent without a break. Each weapon has the ability to cause certain death to an opponent, and they are shot with enough force to repel a swing from Berserker's large axe-sword. While it is possible to block many of the strikes, to do so without knowing the abilities of the weapons can be seen as suicidal. He will generally fight at long range while shooting projectiles from behind him directly at the opponent, but he can also freely move with the portals also moving with him. He can freely deploy the portals mid-air while piloting Vimana as well. When fighting at extremely close range, he shows the ability to loose weapons from above, below, and to the side of the opponent. He can also summon weapons completely around the target for a full 360 degree barrage that should generally leave not even a single trace of flesh from the opponent. When closed upon by a target, or simply to play with the opponent, he can freely draw weapons into his hands for melee combat. The ability to handle them depends upon the user's capability. Gilgamesh makes use of the many unknown abilities of the weapons, and constantly switches them to keep his opponent off-guard.

Knight of Owner is considered to be a natural counter to the Gate of Babylon, but Lancelot is only able to keep up with Gilgamesh to such a degree because of his Mad Enhancement. While capable of playing around with Saber in close combat in the Fate route, he would be outclassed in a sword fight with Assassin, so he would not even attempt it. As he is a "king who possesses over a thousand weapons" rather than a "warrior who chose the path of taking a single Noble Phantasm to its ultimate limit", Shirou Emiya declares Gilgamesh to possess only one ability like himself. As an "owner" like Shirou, Gilgamesh is not a "wielder" able to use a weapon to its maximum potential in melee combat. Within Unlimited Blade Works, Shirou's swords are always ready and waiting, allowing him to be one step ahead of Gilgamesh who possesses the same ability. While Gilgamesh can defeat one who has mastered their weapon with his infinite weapons, Shirou is unable to accomplish that same feat because he lacks the skill, so Gilgamesh is the only enemy he can defeat.

Key
Key of the King's Law, Bab-ilu (王律鍵, バヴ＝イル) is a golden key-shaped sword that connects to the treasury, implied to be able to open any door so long as it has a lock. While he first uses it to open the Gate of Babylon by saying the name of the Noble Phantasm in the Fate route and opens it once in the Fate/Zero novel to retrieve Ea, all other usages have not been shown to require it. When first bringing forth Ea in the Fate/Zero anime and the Unlimited Blade Works anime, he begins by holding it vertically in the air and turning it so that the parts around its grip begin to rotate, start to glow, and then settle. It releases a large, labyrinth-like, red pattern, seemingly crimson cuneiform lettering, that can be seen covering the sky from a great distance away, and then it recedes into a small orb from which he pulls Ea.

In life, Gilgamesh ordered a key to be created for his treasury, said in legend to be able to open the gates deep in the Golden Capital. Deciding that none would dare to ever lay claim upon his treasures, he tossed it away as a trifle. It is an ornate key around the length and weight of a small survival knife, decorated with jewels valuable in both the magical and monetary sense. It is saturated in magical energy of an unknown origin. It is also depicted as being similar to Bab-ilu. It was later found by the ancestor of an unnamed magus, who managed to determine that it was the genuine key without it ever being able to find the treasury. After it was passed down in the family, the magus uses it as a catalyst to summon Gilgamesh in the False Holy Grail War, and Gilgamesh once again tosses it away upon seeing it.

This key to the storehouse of treasures can only be handled by its king, Gilgamesh. The mould of the key is constantly changing. The moment the ability to understand that wisdom is lost upon Gilgamesh's death, the key to the treasury will not open. That “storehouse” in turn was stored as a result, and that treasure became a mystery to exceed mysteries.

Contents
Gilgamesh is renowned for having collected all the treasures in the world in his lifetime, amassing a perfect treasury that lacked nothing. As there was nothing he was unable to collect, Gilgamesh was a collector of treasures, whose favorite phrase, "I collected all the treasures of the earth", is not a metaphor. As anything can be found within the vault, the amount of wealth within exceeds even his own knowledge; it is said that its inventory of treasure continues to increase even now. He collected and stored away samples of all the technology that was developed during his age. The desires of ancient humans were similar to those of the current age, so their technology, bolstered by the powerful magic of his era, was not inferior to that of the modern age. The "Instruments of Hope" that people dreamed of were all realized, and because every single case was requisitioned by the King's hand, his collection is even furnished with airplanes and submarines.

It also contains all of the original bases for all intellectual properties produced by mankind that originated in his kingdom, making board games and the works of the no more than imitations. It is still sought out by some magi, believed to hold all things in the world and enshrine every possible magical artifact. That within are not merely riches, but his collection is the very "origin of human wisdom." It is the proof of human wisdom and human ingenuity. That which is missing from the vault would be items produced with completely new concepts by a new human race and items produced with extraterrestrial intelligence and technology. He is the original hero, so all heroes of various myths are derived from his legend. It may be a paradox, but he, as the original, must possess that which can be handed down as the Noble Phantasms possessed by those later heroes for they are derived from him for that very reason. These weapons are technically nameless, the original Prototypes of the Noble Phantasms (すべての宝具の原型) and the common points before they became objects of faith that act as the foundations for their legends.

Each treasured weapon is decorated with dazzling ornaments and polished to a mirror-like shine, all clearly sporting the magical energy to define them as Divine Mysteries without exception. They are the original models of every legend, myth, and folklore. He says God Hand, a Noble Phantasm formed from Heracles' life and legends, is the one type of asset he lacks. He says he wishes to obtain Kavacha and Kundala, and he is surprised by Avalon's existence. It is also possible, such as with Vasavi Shakti, that he cannot tell if something corresponds to one of the treasures in his vault. Karna's legend records that he "has" the spear, but there is no description of it "being used". It does not exist in his eyes due to never having been described, so he wishes to obtain it.

The weaponry contained within includes swords, pole-arms, lances, hammers, shields, demonic swords that later made their way to Europe and South America, and a number of weapons unidentifiable to Shirou from sight, all of which form a perfect treasury of masses of unused weapons that simply went to sleep with the king. He owns the treasured swords that saved later heroes and the cursed swords that stole the lives of later heroes, and their numbers are approximately infinite. After Gilgamesh's death, the contents were spread all over the world after being passed on or stolen, and the treasures, valued because they were splendid swords, eventually became Noble Phantasms.

Shirou states that the quality of the weapons makes the Noble Phantasms used by others look like fakes themselves. While Cú Chulainn has the Gáe Bolg that became famous, Gilgamesh possesses a weapon that later became the Gáe Bolg, but was not famous at the time Gilgamesh owned it. The only item contained in the vault that was not passed on to another user than Gilgamesh is Ea, a sword unique to only Gilgamesh. Shirou claims that even though he cannot see them all, he can feel that their numbers are infinite. If weapons of a previous incarnation meet those that descended from them, such as Gram facing Caliburn or copies facing originals, the deteriorated newer model will always lose.

It contains numerous A ranked weapons, capable of piercing God Hand dozens of times to take eleven of Berserker's lives and then piercing him with twenty-three more weapons afterward. Just a single weapon is enough to pierce Caster's strongest shield and keep any other Servant on the defensive. The numerous weapons contain various different effects and abilities, allowing him to assault the weaknesses of any Servant. This places him at an advantage over most Servants in combat, such as attacking with a weapon strong against a certain attribute or assaulting a Servant with a weapon they were specifically weak against during life.

The Gate can also carry living beings, as shown when Gilgamesh uses the Gate to transport Shinji Matou to the Einzbern Castle.

As a child, although the amount of contents emitted is lower than what the adult Gilgamesh in his normal state has, it seems that he is picking and shooting Noble Phantasms that are intended to observe and test the opponent's capabilities in order to identify and "strike their weak points."

Named Items

 * Bullworker: Really Plain Test is a device used to train muscles.
 * Caladbolg
 * Command Spells of an unknown number have been collected by Gilgamesh in the Moon Cell. They are the lifeline of Masters in the Moon Cell Holy Grail War, so it is unimaginable that a Servant would be able to provide a new set to his own Master. While such a thing would shake the foundations of the Holy Grail War, Hakuno Kishinami rationalizes that Gilgamesh is simply such a Heroic Spirit, proving why he is sealed within the Far Side of the Moon.
 * Dáinsleif (ダインスレフ) is a demonic sword from the . It is a sword that has been in two myths, with both versions showing its frightening nature. Within the, it is a sword that was part of 's collection of treasures, taken by the clan that killed the Northern European hero, Sigurd. It is a cursed Noble Phantasm that contains a powerful curse of "reparation" to be used on its target, and it also drives the fate of its possessor to ruin and causes them to surely die. Within the , it is possessed by the Danish King, Hogni. He became locked in eternal combat with the King of Serkland, Hedinn, due to the sword's curse, which requires it to always kill a man once drawn and does not allow it to return to its sheath until such is accomplished. While demonic and holy swords carry with them both glory and destruction, Dáinsleif is said to only bring the latter onto its master.
 * Durandal
 * Ea - Ea is the most powerful weapon inside the Gate of Babylon, and it is the one favored by Gilgamesh. He is able to use a rain of weapons to keep the opponent off-guard while preparing to use it.
 * Enkidu
 * Gáe Bolg
 * Gram
 * Harpe
 * Houtengeki (方天戟) is one kind of halberd passed down in Chinese culture and the only type of halberd out of many to attain the rank of Noble Phantasm, probably due to the use of Houtengageki (方天画戟) by a famous military commander. It is a polearm with many different uses such as thrusting, swiping, pulling, parrying, and various others. Chinese halberds have a spearhead at the tip of the shaft and a blade attached to the side, and the distinguishing characteristic of a Houtengeki is a unique crescent-moon shaped side blade, the “Moon Fang”. Weapons with only one of these blades are called Seiryugeki. It is said that a great deal of skill is needed to handle this weapon, though its versatility and ease of use once mastering it allows for it to be used to serve the appropriate role for any type of combatant. Its use eventually went out of favor as different dynasties rose and fell until it was revived during the as Houtengeki.
 * Merodach
 * Potion of Youth
 * Vajra
 * Vimana

Unnamed Items

 * Anti-Spirit Incense (反魂の香) - When facing Avenger's corpses, Child-Gil spreads a silver ash around himself. Forming a mist with a peculiar scent, it attracts the corpses to him.
 * Armor
 * Auto-Defensor (自動防御) - A series of golden discs that floats in the air to intercept attacks coming within range, able to be set up so as to protect an entire floor of a building. At twenty meters, it automatically sends out an innumerable series of small lightning bolts to strike down the target. It is possible for attacks like the arrows shot by True Archer to slip through the defenses despite the great speed of the lightning.
 * A Defensive Armament that protects against the Multi-Dimensional Refraction Phenomenon, capable of stopping Tsubame Gaeshi as a result.
 * Golden Armor
 * A Mirror Shield used to effortlessly repel strong magecraft.
 * Axes
 * An Axe with the ability to change its path after being avoided by the target, allowing it to turn around in mid-air towards the target at a speed that allows it to match the pace of a jet.
 * Golden Axe - One of the few melee weapons Gilgamesh uses in the Moon Cell, the golden axe is used to slash the opponent and hit them with a heavy overhead chop. When used with the "Clear the Storm" Skill, he shatters space with a spinning chop. He also uses a similar Golden Axe while in the Caster class.
 * Heracles' Axe
 * Cooking Items and Food
 * Fully Automatic Cooker (全自動調理器) - From ancient, it is an extremely high performance machine able to process even hazardous ingredients like hydra meat without issue. It has a limiter that can be removed to improve performance, but it can potentially break it.
 * Hydra Meat - An extremely poisonous meat, it required a special license to cook that only Gilgamesh ever obtained.
 * Meat that multiplies in proportion to how much is eaten.
 * A Poison Tasting Noble Phantasm
 * Seasonings and herbs are contained in the vault, but Gilgamesh notes that none could make the almost-poison cooking of Lancer palatable. There is an herb that can prepare the stomach for such a meal, but it causes permanent upon consumption.
 * Tablecloth - Prototype of the Table Cloth of the North Wind (北風のテーブル掛け) of, it will produce the finest of foods the user chants as it is spread upon a table.
 * Wine - "The King's Wine" as claimed by Gilgamesh, contained in a set of wine bottles made of heavy gold that are inset with sparkling gems. Rider believes that it could not be brewed by human hands, asking if it is a "drink of the gods", to which Gilgamesh affirms by boasting that "Whether wines or swords, only the best is stored in my treasury."
 * Curtain of Night (夜の帳) is mentioned as something that could be used to counter Gawain, possibly affecting his Numeral of the Saint Skill by blotting out the sun.
 * Golden Drill - One of the few weapons Gilgamesh uses in the Moon Cell, the golden drill-like weapon is used to jab at the opponent and damage them with the spinning sword-blades, as well as with machine gun and cannon fire.
 * A Hammer larger than Saber.
 * Lens - He possesses a golden ring with a single, strangely-warped lens fit inside of it, able to show a distant landscape like a telescope. Gilgamesh uses it to see True Archer twenty kilometers away.
 * Lightning - Gilgamesh launches "lightning without form" as a projectile.
 * Levitation - Gilgamesh possesses a treasure that grants some form of levitation.
 * Machine guns, nuclear warheads, and other weaponry from ancient India that were previously equipped to Vimana. They were removed and stored within the vault.
 * Mystic Codes
 * A stone tablet acting as his "spellbook", able to cast runes from it.
 * Countless Magical Staves that can manipulate magic from the Age of Gods.
 * Various Magical Staves that can flare magecraft-based fire attacks.
 * Various Magical Staves that can launch magecraft-based homing light attacks.
 * Various Magical Staves that can surge magecraft-based lightning attacks.
 * A Retrieval Noble Phantasm that returns weapons to the vault no matter how far they travel.
 * A Ring that wards the gazes of normal people away from the wearer so as not to notice them. It is not powerful enough to affect magi.
 * Sickles
 * A Giant Sickle able to cleave a weapon enhanced by Knight of Owner in a similar manner as Gáe Dearg.
 * A Sickle that drains away magical energy and deals damage while passing directly through flesh and armor without causing any actual physical damage.
 * A Scythe with the ability to change its path after being avoided by the target, allowing it to turn around in mid-air towards the target at a speed that allows it to match the pace of a jet.
 * Spears
 * Gilgamesh launches a "spear that killed heroes" as a projectile.
 * Golden Lance - One of the few melee weapons Gilgamesh uses in the Moon Cell, the golden lance is used to stab at the opponent.
 * Spears capable of piercing through mountains.
 * Swords
 * Golden Swords - One of the few melee weapons Gilgamesh uses in the Moon Cell, the golden swords are similar to Enki used by Gilgamesh of Fate/Prototype, but it is unknown if they are the same swords. He uses the single right-hand sword for a regular downward swing and a powerful, quick backhand swing with the "Loose the Winds" Skill. He uses both swords in a jumping overhead X-shaped slash.
 * Invisible Swords like those clad in Invisible Air.
 * Long Sword - Gilgamesh launches a "long sword that slayed an oriental dragon" as a projectile.
 * A Scimitar with the ability to change its path after being avoided by the target, allowing it to turn around in mid-air towards the target at a speed that allows it to match the pace of a jet.
 * Swords capable of piercing through mountains.
 * A Sword of Ice that freezes the space that it cuts, allowing it to cover the target in ice even if they managed to dodge the actual strike.
 * A Three-Edged Sword able to arc behind the opponent to attack them from an unguarded position.
 * Vehicles
 * Airplanes were created in Uruk due to the desires of humans being the same as those of modern-day, and with the magecraft of his time, it meant that the ancient crafts were not inferior to those of modern times.
 * Ship of Light (光の船) that allows him to travel faster than the speed of light. It allows him to instantly return after he is sent to the edge of the Moon Cell's Imaginary Space hundreds of lightyears away. When the feat is questioned, he mentions that it is obvious that he would have a Noble Phantasm corresponding to a technique that sends the target to the edge of space as his vault holds the origin of human wisdom.
 * Submarines were created in Uruk due to the desires of humans being the same as those of modern-day, and with the magecraft of his time, it meant that the ancient crafts were not inferior to those of modern times.

Fate/kaleid liner PRISMA☆ILLYA
The Gilgamesh of the Fate/kaleid liner PRISMA☆ILLYA world possesses a number of Noble Phantasms not shown to be present in the vault of the regular Gilgamesh. It is unknown if the contents overlap between the two.
 * Arrow Protection Amulet
 * Ea is Gilgamesh's trump card and his most powerful weapon. It is able to tear through the Mirror World and the boundary to Miyu's world. Though it loses to Illya's final attack, he mentions that it was the best he could do while half-incarnated.
 * Enkidu is Gilgamesh's most trusted Noble Phantasm. He is outraged by Angelica's usage of it, and he is able to take it from her. He displays great control over it, allowing him to take a large number of weapons from Angelica into his own Gate of Babylon, take people to safety, and use it as a shield to deflect the thrown Mjolnir.
 * Hades' Cap of Invisibility
 * Hot Spring Noble Phantasm
 * Ig-Alima
 * Sul-sagana
 * The Shield of the Gods
 * True Nine Lives
 * Vimana