Domain Expansion

**Domain Expansion** (領域展開りょういきてんかい, Ryōiki Tenkai) is an advanced Barrier Technique and is considered the pinnacle of jujutsu sorcery. It constructs the user's innate domain inside a barrier infused with their innate cursed technique. Within a domain expansion, the user's cursed techniques are improved and any that are activated are guaranteed to hit.

## Description

Domain expansion is the most supreme technique of any jujutsu user. It is achieved by expanding one's innate domain with cursed energy while using a barrier to construct it inside a separate space. The caster then imbues their cursed technique within the barrier to complete the expansion, allowing them to deploy their ability all throughout the domain. The domain is embedded with the user's cursed technique to complete the formation.

A specific hand sign or signal unique to the user is required to expand someone's respective domain. From the outside, a domain's barrier is normally completely closed, making it appear as a floating black sphere that can even be moved slightly if needed.

Once inside, the user's jujutsu is greatly amplified and any attack deployed is a guaranteed hit. Using a hand sign or another sort of signal unique to the technique is one of the requirements to activate it.

Manifesting an innate domain with cursed energy requires a lot of power, and erecting a barrier requires even more so. Domain Expansion is a difficult technique to learn that most high-level sorcerers are never able to master. Among cursed spirits, only special grades like Mahito, Dagon, and Jogo have shown the ability to use the Domain Expansion.

## Drawbacks

A high-risk, high-reward manoeuvre, Domain Expansion provides a great advantage at the cost of an immense amount of cursed energy. Satoru Gojo is considered to be one of the only individuals that can use domain expansion multiple times in one day. Kinji Hakari is only capable of casting it repeatedly after hitting his domain's jackpot to replenish cursed energy and stabilize his cursed technique.

Even if the barrier or the environment aren't fully formed, casting domain expansion will cause the user's innate technique to become unstable for a short time afterward. Attempting to use cursed techniques during this period will cause them to burn out and fail to activate.

## Countermeasures

A domain's can't-miss attack can sometimes be countered with cursed energy reinforcement, but this is an impractical method. The only true defense against can't-miss attacks for those who cannot expand their own domain are anti-domain techniques. New Shadow Style: Simple Domain and Hollow Wicker Basket neutralize the barrier's embedded technique in order to nullify the guaranteed hit function.

Domains are nearly impossible to escape from the inside. The cubic volume of the space appears completely different on the inside, making finding the boundary's location difficult for anyone trapped inside. Anyone searching for the edge of the domain is likely to be killed by its can't-miss attack and the barrier is reinforced from the inside even if they did find it. However, the more the barrier is reinforced from the inside, the more vulnerable it is to penetration from the outside. In specific situations, an ally of the domain's target can break in from the outside to rescue them.

### Domain Clash

The best countermeasure against an opposing domain is to expand one's own domain. This will engage both combatants into a clash of domains where the more refined domain will conquer. The time it takes for one domain to dominate in a clash varies on that difference in refinement. E.g. Satoru Gojo's superior domain immediately dominated Jogo's while Dagon's domain took a much more significant amount of time to subdue Megumi's. In the case of overlapping domains, sure-hit effects cancel each other out. When two domains are completely even and the users fight with their domains open, the moment one combatant takes heavy damage or their domain collapses, the other's can't-miss attack will immediately strike. A clash of three domains is even more complicated than two and too many conflicting factors can cause the barriers to shatter before the domains are completely formed. Domain clashes don't always have to result in one domain conquering the other. Using Domain Expansion against a more refined domain can create a hole in the barrier for them to escape from as well.

## List of Fan Made Domain Expansions

***This list only compiles Domain Expansions of the Fanon Wiki. For a list of canon Domain Expansions, please refer to this page.***