Heronian Aeolipile

Heronian Aeolipile
Name Information
Kanji	アイオロスの球
Rōmaji	Aiorosu no Kyū
Other Names	Heronian Steam Engine (ヘロンの蒸気機関, Heron no Jōki Kikan)
Item Information
Type	Tool (Aeolipile)
Activation Method	Boiling up
Wielder	Nils' Grandmother (Former) Nils Lees
Nature information
Power	Steam Manipulation
Debut
Manga	Case 14

The Heronian Aeolipile (アイオロスの球, Aiorosu no Kyū; Literally meaning "Aeolipile") is in possession of Nils Lees, and is related to the production and manipulation of water steams, such as mist.

Description

The Aeolipile in stationary state.

The item is an early designed aeolipile, that is, an instrument that emits steam when pressurized, though due to being an Eureka, it is able to produce steam, most notably mist, on its own. It possesses a spherical vessel and two curved nozzles at a same point of its axis, that when activated make the Aeolipile rotate around itself. While the nozzles seem to be metallic, the vessel has a leather-like look, due to its stitches. It is also rather small and light, as Nils Grandmother used to hide it inside her hat.

The Aeolipile's power seem to be controlled by the user's will, as it can be seen in both stationary and active states without an apparent interaction of the user. In addition, it is able to float due to the steam produced.

Powers

Through the use of the Eureka, users are able to freely manipulate water vapor such as mist, combining it to make solid entities. Such use can be particularly extremely powerful and lasting, as even dead, Nils' Grandmother, once a wielder of the Aeolipile, managed to sustain creations made out of mist that acted intelligently after her death.

• Mist Labyrinth (霧の迷宮, Kiri no Meikyū): The user is able to create an enormous labyrinth made out of mist, that can even looked like a small town. The labyrinth is solid, and is able to recover itself if torn down, with a significant high speed. Additionally, the Labyrinth intelligently expands itself when in the presence of people, creating walls to stop anyone who would try to explore it, both at the level of the ground and in the air.

• Mist Minotaur: The user is able to create solid Minotaurs to serve as fighters or guardians. Despite made out of inorganic substances, the creatures are intelligent, reacting on their own and obeying the user's commands. They are also able to recover themselves when slashed, though slower than the Labyrinth.

• Mist Phantom (霧の幻, Kiri no Maboroshi): This uncanny use of the Eureka allows the user to store their own conscience and spirit inside the mist to keep the Aeolipile, that also reacted intelligently.

Additionally, upon activation of the Aeolipile, the user's eyes will manifest a symbol in which highly resembles the shape of the said Eureka. Thus, a symbol of a circle with a pair of crooked lines will appear on the user's irises.

Nils' eyes when using the Eureka's power.

The Mist Labyrinth.

The Labyrinth expanding itself.

Nils' Grandmother's Mist Minotaurs.

Nils' version of the Mist Minotaur.

Enhanced Form

After consuming a peculiar Hungry Joker Pill, non-hybrid user manages to artificially enhance their Eureka-compatibility and rises to the same power level as that of user whom possesses a hybrid blood.

• Absolute Steam Manipulation: The user is now has achieve high enough power that they could even turned solid substances such as ice into their gaseous state. Thus, employing sublimation phenomenon.

When in this form, the user is now can be seen constantly emitting steam from their body. Their irises marks had also been slightly altered in which their normal marks that of a circle with a pair of crooked lines, are now surrounded by three pairs of the said lines.

Nils' evolution stage.

Nils' enhanced eyes.

Nils turning ice into steam.

Combination

• Newtonian Apple: The Aeolipile is also shown to be able to combine its power with the Apple. To do so, the Aeolipile starts gathering steam around the users and together with the Apple's power, condensing them into a body of water.

Aqua Cage (水の檻（アクアケイジ）, Akua Keiji): A huge mass of mist is produced around the users, effectively hiding them in the mist while they prepare the attack, that consists in surrounding the target with such mass of mist in the shape of a dome, and then using the gravity to increase the mist's pressure in order to condensate it and create a giant water dome to trap the target inside. Other portions of mist also get condensed, making giant water bubbles to surround the dome as well.

• Water Cutter (超高圧水切断（ウォーター カッター）, Wōtā Kattā): By controlling the shape of the water present in the Aqua Cage's wall, the users can mold the water into a syringe-shaped format, that can forcefully eject ultra-high-pressurized water from its pump, that can slice anything that comes in contact with it.

• Cage Violate (檻の蹂躙（ケイジバイオレイト）, Keiji Baioreito): The users of both Aeolipile and the Apple create several Water Cutters, all of them pointing at a target, and then make all the water present in the dome to be ejected from them with a great force, causing the Aqua Cage to burst into water and be dispelled in rain.

Haiji and Nils creating a dome made of water.

Dodomekis attacked by high pressured water cutter.

Dodomekis about to be hit by Cage Violate attack.

History

Nils receive the Eureka from his Grandmother.

According to Nils Lees, this Eureka has been passed down to his family's generations since a long time ago, although they didn't know why this particular item was able to grant them strange powers. When Nils' Grandmother was killed by Dodomekis, she managed to erect a giant Mist Labyrinth and store her spirit inside it, to be revealed only after Nils' arrive in the Labyrinth. With this, she was able to pass down the Eureka to him.