Barrier

Barrier
Title
Kanji	結界
Rōmaji	Kekkai
Capabilities
User(s)	Sorcerers Cursed Spirits
Type	Jujutsu
First Appearance
Manga Debut	Chapter 1
Anime Debut	Episode 1

Barriers (結 (けっ) 界 (かい) , Kekkai^?) are zones or territories established with jujutsu. They are generally used to conceal, contain, or deny entry to entities within that space. Cursed techniques that erect barriers are known as barrier techniques.

Description

Barriers are territories of various sizes and effects that anyone with enough cursed energy can learn to create. To surround and protect the user is the most basic use of a barrier. However, some barriers, like curtains, have an outer shell to protect the edge while others do not.

Complex barriers can be customized with certain conditions using binding vows and talismans, but this takes a certain degree of skill to accomplish effectively. i.e Barring certain people from a barrier while allowing others in is complicated to achieve. Barriers only recognize individuals with cursed energy and they completely ignore inanimate objects and buildings.

Types of Barriers

Curtains

Main Article: Curtain

A Curtain is a barrier with a large dome-shaped outer shell that hides everything within it from external view. Inside the barrier also turns the sky to night, luring cursed spirits out of hiding.

Suguru Geto lowering a curtain.

A large curtain cast in Shibuya.

Domain Barriers

The spherical enclosed barrier of a domain expansion.

Barriers are the foundation of any domain, whether it be a fully expanded innate domain or a simple domain. An environment can be crafted out of cursed energy within a barrier. If that environment is an innate domain and the barrier is imbued with an innate technique, it is considered a complete domain expansion. In other cases, incomplete domains can create or completely change environments within the space of a barrier. Simple domains also use barriers that can be customized with binding vows or the lack there of.

An enclosed barrier forming around a simple domain.

In most cases, the barrier of a domain expansion has an enclosed, spherical outer shell. The barriers are generally reinforced from the inside but there are exceptions. The outward appearance of the domain is entirely different in size and scale compared to the domain expanded within. A concrete image is most important when erecting a barrier that creates an artificial environment over real physical space of a different size. Barrier techniques of this degree are difficult for even the most gifted sorcerers.

A domain's barrier can be affected by numerous factors. There are several ways a sorcerer can interact with their domain's barrier. Even after a barrier is fully formed, its placement can be moved by the user while they're still in the domain. A clash between multiple parties attempting to expand their domain with excessive conflicting factors can result in their barriers collapsing before being fully stabilized.

A domain clash resulting in the collapse of barriers before they are established.

Domain barriers in particular typically have set internal and external parameters, including volume and construction speed. As a result, it ordinarily takes time for a sorcerer to discover the precise blend of conditions to establish their domain's barrier. These conditions aren't usually adjusted after being established, especially not every time the barrier is cast. Exceptions are individuals whose innate techniques expand their domains by default.

One way to forcibly close a barrier without the proper skill is to overlay it with a physical structure. However, the barrier imbued with the user's innate technique will not incorporate a can't-miss attack, arguably the greatest strength of a domain expansion.

Empty Barriers

Empty Barriers (空 (くう) 性 (せい) 結 (けっ) 界 (かい) , Kūsei Kekkai^?) are, as the name implies, barriers that are almost entirely vacant inside their boundary. The edge of these barriers are made of hexagon-shaped panels and they can be freely altered by a skilled barrier technique user. i.e. Kenjaku converted one into a movie theater to show Choso his plan. Tengen created numerous empty barriers above the Tombs of the Star Corridor and could freely peel open a barrier or erase it completely if necessary.

Kenjaku invading the labyrinthine barrier above the Tombs of the Star.

Choso inside one of the empty barriers.

Kenjaku manipulating the environment to create a theater.

Kenjaku's domain dispelled along with the empty barrier.

Pure Barriers

Pure Barriers (浄 (じょう) 界 (かい) , Jōkai^?) are superior to regular barriers. Tengen maintains numerous pure barriers across Japan that improve the barrier techniques of Jujutsu High managers and suppress cursed spirits. Four of these pure barriers are critical: One with the Imperial Palace at its center, one at the Tomb of the Star, another at Yamakuni Mausoleum in Kyoto, and the largest of them that divides Japan into east and west at the Holy Mountain of Hida.

The pure barriers across Japan.

The four pivotal pure barriers.

Bon Barrier

Bon Barriers (梵 (ぼん) 界 (かい) , Bonkai^?) are even stronger than pure barriers. The Culling Game is built on bon barriers that use Tengen's pure barriers as their base. Tengen could've released these barriers to prevent the Culling Game but that would've meant relinquishing a thousand years of progress in the struggle against curses.

Trivia

• Translation Note: In English, the word "barrier" implies a defensive wall. However, Kekkai (結界, Kekkai^?) means a zone, territory, or field with a boundary. An outer wall is merely a component of a barrier and is irrelevant to the literal definition of Kekkai.

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