Eureka

Examples of Eureka.

Eureka (エウレカ, Eureka) (Greek: εύρηκα, heúrēka; lit. "I have found") is a term that defines items that can give their users different levels and aspects of enhanced capacities, depending on how it is used and the degree of compatibility of the user with them.

Description

Origins & Nature

A Eureka restoring itself.

The maternal Eureka was the Fruit of Genesis (果実は母体, Kajitsu wa Botai), created by God Himself. Since it was eaten by the man, it enabled other Eureka to be created at some point as a result of some events, and there were even ones created by humans. The reason of their existence until the current times is their indestructibility, manifested in different aspects for each Eureka, such as immunity to decay, self-restoration, and unlimited multiplication.

The Eurekas are paranormal intelligent entities, as it's said that they choose their adapters, which was proven to be truth when Chitose Toriiooji, initially a non-compatible individual, was chosen by an Eureka itself to become its adapter, where an independent act of the same Eureka was observed to be embedded inside Chitose. Killed's statement that Eurekas "bestows powers of truth" also corroborates with this idea. It's implied that there is some kind of essence shared by all Eureka that can be detected via an Eureka Locator.

A user and a corpse displaying the glow.

Eurekas are also somehow related to a kind of organic glow, that appears in several instances, like in the body of a user when he's activating the power of the Eureka or covering the entire corpse of a dead person affected by such powers or killed as result of being a non-compatible person that tried to make use of the item, as indicated by Heidi's research.

Users

Adapters with their Eureka.

An individual compatible with the Eureka, known as an Adapter, is sometimes referred as a Chosen One (選ばれた人間, Eraba Reta Ningen) by the Mavro race and Awaker (覚醒者, Kakusei-sha) by humans. It's said there are two kinds of such individuals: Humans, whose compatibility factor is a result of a genetic mutation; and Mavros, whose compatibility was ensured to them a long time prior their birth, therefore belonging to a different species. A human Adapter is called a Genius (天才, Tensai) by the Mavros, while a Mavro Adapter is referred to as a God (神, Kami) by both themselves and humans. However, a third type was created as a result of Nacht's experiments on his younger brother, known as a Hybrid (混合作用（ハイブリッド）, Haiburiddo) by humans and a Demigod (半神, Han Kami) by Mavros. The Adapters' power is to make use of the Eureka's effect without losing their life and, additionally, Gods are said to be able to use their abilities freely, without risk.

The Eureka, however, bestows powers of truth in accordance to the compliance ratio of that individual's body. This means that even if an ordinary humans were to acquire an Eureka's knowledge, it would be nothing but a mere fragment of the whole picture. Due to this compliance ratio, many Adapters didn't obtain the powers given by the Eureka, but received the knowledge inherent to it through a lighter use.

Effects

Eureka user's eyes.

Eureka has two different main effects on those who use them. It can either grant an Adapter superhuman powers over a certain phenomenon; or, if used lightly, it gives them the knowledge about the phenomenon's nature, although in a much smaller scale, even if considered great by normal human. If used by somebody that doesn't belong to any of these categories, they will die, and it's implied by Heidi's research that they will become a Glowing Corpse afterwards.

Additionally, during the time that the powers are being used, the user's eyes will start to glow and the Eureka's distinguishing traits will be drawn on their surface. Eureka users also have been shown to possess some sort of instinct that allows them to identify a fake Eureka and to locate a real one, though it may require some concentration, as they can be fooled with well-done forgeries.

Usage & Risks

Users making use of their Eureka.

To acquire the powers of an Eureka, an Adapter must interact with the nature of the item, meaning if a Eureka is something editable (such as a fruit) it must be eaten, while if it's a tool (like a hammer) it must be maneuvered. Once acquired, the user has several methods in which to utilize their powers, although powers have limitation these can be slowly removed as the user increases their level of experience and mastery. The extent of an Eureka's usage isn't even limited by the death of its user: If used in the last moments of the user's life, the Eureka's power can actually persist even after the death of its current wielder; this can be seen wheng Nils' Grandmother created a giant, sentient Mist Labyrinth even after she'd passed away. A lighter contact with the Eureka must be obtained in order to gain the knowledge inherent to it, like hearing the sound produced by a tool or drinking the juice of a fruit.

The Mavro race is strictly related to the Eureka, and is known for being able to use them freely without restriction. In addition, they can also make wider and stronger uses of the Eureka due to lacking the strain on their bodies.

Training

To master an Eureka, it may be necessary training and intense undergoing of experiments, that may also involve non-compatible humans that, as result, acquire a certain affinity with the Eureka and its actual user, even being able to channel some aspects of the Eureka's power. In other cases, however, the users' body simply becomes more accustom with the Eureka's powers, which facilitate the usage of its powers, and the compliance ratio of the Eureka and its user also allows some users to manifest their powers the first time they using it.

Amplification Method

Although an Eureka only bestows power according to the user's capability, there is a method that essentially allows users to boost their power. This method of amplification involves taking an extra intake of that particular Eureka, such as when Killed gives the Harpy an extra Pea, allowing her to further mutate her body. Another case of amplification is when Heidi takes two bites of the Apple, boosting his Gravity Intensification techniques to the point where he could swiftly tear down multiple walls at once. However, this method is not without risk for humans, as the strain of using the Eureka will also increase; this can be seen when Heidi, after performing the aforementioned feat, started vomiting blood a moment after using this method.

Heidi in his Enhanced Form.

There's also an Enhanced Form that can be accessed by the Eureka's users to obtain the full powers of their Eureka. The only way to reach this level is via applying the Landsteinerian Paint's power onto an individual that possess both human and Mavro characteristics within their blood, thus it is limited to Hybrids. Aside from the abnormal increase of their power, those who reach this level also have their appearance changed drastically. Another artificial method was created by the White Joker through the research of Heidi and Chitose Toriiooji where they managed to manufacture a certain pill that is capable of reproducing the same Enhancing Form that Heidi was able to attain with the help of the Landsteinerian Paint.

Combining

Eureka being combined.

It's said that if combined, Eureka can create a power that would easily destroy the entire world. However, when done on a smaller scale, the combination of the Eureka generate more powerful effects for their users. This can be done directly via making two Eureka touch each other, subsequently granting their users the powers of both simultaneously upon activating them. This process, however, was shown to be very heavy consequences on each user's body, resulting in major injuries in the attempt and potentially even death. Additionally, when touched, an intense glow and whitening of the used Eurekas can be observed. The combination of the Eureka can also be done indirectly, where an user enhances the product of another's Eureka with their own.

Embedment

An Eureka fusing itself inside its adapter's body.

An Eureka can also be embedded inside the body of a person. This occurs, for example, when an Adapter makes direct contact with a Eureka which then fuses inside their body, although accidents can also result in the embedded; in this case, if the Adapter doesn't have control over it, the Eureka will manifest itself on their body uncontrollably. With better control however, Adapters can utilize the Eureka directly from their body at will, therefore possessing the advantage of not having to interact with it to manifest their powers nor having to worry about it being stolen.

Restrictions

Drawbacks of continuous use of Eureka.

Human Adapters have a limited amount of time to use the granted powers, with the maximum amount of time seeming to be around five minutes. Additionally, the continuous usage of them is risky, where if an Adapter uses the Eureka many times after its effects have worn off, their body will start to be pushed as result of exceeding its capacities, usually causing hemorrhage. Death was also mentioned to be a consequence, specially when a greater usage of the Eureka is made, like combining them. Also, humans can only be chosen by one Eureka.

Importance

The progress brought by the scientific knowledge.

The knowledge gained by Eureka's adapters provoked several immense revolutions in the scientific world, that constituted the basis of several important concepts and inventions essential for the progress of the mankind. These adapters became renowned people praised by their discoveries even in the current days. Potentially, the opposite effect is also possible, as several apocalyptic scenarios are said to be able to be artificially created by using the Eureka.

The destruction brought by wicked doctrines.

The Eurekas, however, were seen just as a curious part of their discoveries or even myths, thus causing them only being known to a small number of people. Often a discovery is related to an attempt at using the Eureka, the people knowing about it are rare, as only Adapters can use them, while normal people die as a result. On the other hand, it's said the awareness of Eureka already reached the United Nations. Due to the fantastical capacities of Adapters, it's common for normal humans who've witnessed their powers and are unaware of Eurekas to view them as Gods. Many of these Gods, however, have been responsible for several tragic events that put all of humanity at risk, due their heinous beliefs.

Organizations

Main article: Mavro Main article: White Joker

Due to being able to wield Eureka without restrictions and belonging to a different species, the Mavro (黒い神軍（マブロ）, Maburo) view themselves as being superior to normal and humans as well as being the true masters of the planet; therefore, they've banded together and formed a terrorist organization to seek their personal desires. In order to stop this, the United Nations secretly created the "World Science Rescue Intelligence", also known as White Joker (ホワイトジョーカー, Howaito Jōkā), which consists of a number of human Adapters. The organizations rival with the Black/White theme, seen in their names and uniform sworn by their members, as the White Jokers wear white coats and the Mavros wear black clothes. Both share the goal of gather all the Eureka, as well destroying each other.

List of Eurekas

Newtonian Apple Wielder: Heidi	Mendelian Peas Wielder: White Joker	Pythagorean Hammer Wielder: Alan Blackman
Thalesian Amber Wielder: White Joker	Sumerian Ruby Wielder: Vivian Blanchard	Heronian Aeolipile Wielder: Nils Lees
Curare Beak Wielder: Mavro	Roentgenian Fluorescent Paper Wielder: Riz Aquilanti	Landsteinerian Paint Wielder: Chitose Toriiooji
Unnamed Eureka Wielder: White Joker	Unnamed Eureka Wielder: White Joker	Unnamed Eureka Wielder: White Joker
Unnamed Eureka Wielder: White Joker	Unnamed Eureka Wielder: White Joker	Darwinian Seed Wielder: White Joker
Edenic Fruit of Knowledge Wielder: Heidi

Influence

Eureka is often associated to the moment when someone finds out the truth about a subject. Therefore, the name given by the series to these items is pretty suitable, as many of them led several people to discover things about the world.

Eureka (εύρηκα, heúrēka; Literally meaning "I have (it)" or "I have found (it)") is an interjection that comes from the Ancient Greek language. The word is commonly attributed to a popular story in which Archimedes, after stepping into a bath and noticing that the water level rose, suddenly understood that the volume of water displaced must be equal to the volume of the part of his body he had submerged. He then would have gone, naked, to the streets while exclaiming "Eureka!".

Archimedes of Syracuse (Αρχιμήδης) (c. 287 BC – c. 212 BC) was a Greek mathematician, physicist, engineer, inventor, and astronomer. Although few details of his life are known, he is regarded as one of the leading scientists in classical antiquity. Among his advances in physics are the foundations of hydrostatics, statics and an explanation of the principle of the lever.