Domain Expansion

Domain Expansion is an advanced barrier technique that manifests the user's Innate Domain and traps their target inside it using a barrier wall to create a separate space. Once inside, the user's cursed techniques are improved and cannot be avoided.

Description
Domain Expansion is the most supreme ability of any jujutsu user. The user can realize their innate domain by casting a barrier to create a separate space and using cursed energy to construct the environment within it. The target is trapped within the barrier and the domain is completed once it fully embeds the user's innate cursed technique.

Complete domains that are constructed to be lethal require immense skill and a lot of cursed energy to create. They amplify the user's cursed techniques and any that are deployed are guaranteed to hit their target. In the modern era of sorcery, using Domain Expansion is extremely rare and even most grade 1 sorcerers are never able to master it. A signature hand-sign or another sort of signal is one of the conditions required to activate a lethal Domain Expansion.

In the past, Domain Expansion was a more common technique because domains weren't constructed to be fatal. They only forced targets inside to obey the rules of the embedded cursed technique. and the number of users greatly decreased over time because most now include deadly can't-miss attacks.

Drawbacks
Domain Expansion requires an immense amount of cursed energy and the user's innate technique will become unstable for a brief time after deactivating their domain. Additionally, the user's cursed energy reserves will be extremely low and it is unlikely they'll be able to cast a second domain. Satoru Gojo is the only person capable of using domain expansion more than once a day.

Even after achieving the activation of domain expansion with a cursed technique, a domain can still be incomplete if the user is unable to fully form the barrier. The technique won't provide the guaranteed hit, but unlike improper innate domains, the user's cursed techniques are still vastly improved.

Countermeasures
The automatic hit provided by a Domain Expansion can be countered with a blast of cursed energy, but this method is impractical for most. The only true way to counter Domain Expansion is for the target to expand their own domain or unleash a Simple Domain. This automatically nullifies the automatic hit, and both Domain users will enter a struggle where the more refined domain will win.

Escaping a domain surrounded by a barrier is almost impossible. 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 to rescue them.

Domain Expansion struggles 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.

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