What is domain expansion?

Domain expansion, in the context of fictional universes like those found in the Jujutsu Kaisen anime and manga, refers to a technique where a cursed technique's area of effect is vastly expanded. It's not a universally understood concept outside of that specific fictional setting, so any explanation needs that context.

In Jujutsu Kaisen, domain expansion is a high-level technique only accessible to very powerful jujutsu sorcerers. It involves:

• Creating a "Domain": A sorceror creates a unique, enclosed space warped by their cursed technique. This space is entirely under their control.
• Infinite Void: Within the domain, the user's cursed technique operates at maximum efficiency, often overwhelming opponents who haven't prepared for it. The space can manipulate reality within its boundaries, often to the user's advantage.
• Overwhelming opponents: The sheer power and control of a domain can cripple opponents before they can even react effectively.
• Requirement for Skill and Cursed Energy: Creating and maintaining a domain requires immense cursed energy and precise control over one's cursed technique. It's not something that can be learned easily.
• "Simple Domain" vs. "Domain Expansion": A simple domain just alters the environment; a domain expansion takes this much further, creating a far larger, more heavily controlled area.
• Countermeasures exist: While powerful, domain expansion isn't unbeatable. Opponents can employ their own domains, or other techniques designed to counter or escape a domain.

In short, domain expansion is a game-changing ability in Jujutsu Kaisen, representing a significant leap in power and a testament to a sorcerer's mastery. It's a highly strategic technique with both offensive and defensive applications. Outside the context of Jujutsu Kaisen, the term doesn't hold a commonly understood meaning.