Domain Expansion (Jujutsu Kaisen Supplement)

Domain Expansion

The king of curses opening it's domain, source [1]

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.

Domain Basics

All domains are different from one another, varying in it's hand signs or techniques. However, they all tend to follow the same base rules unless otherwise stated.

Expanding Your Domain

All domains require a specific handsign for it's expansion to be activated, taking a Full Turn Action to activate. All domains cost 30 Cursed Energy unless specified, and takes all creatures of your choice in a 175ft. circle centered on you, creating a barrier for 1 minute. The insides of a domain expansion varies from user to user, since it's like showing your soul to your opponents. Outside of your domain, it's appearance is of a giant black sphere floating in the air.

All creatures outside your domain will receive xd6 bludgeoning damage(with x being your Charisma modifier) and be pushed to the edge of the barrier. They receive additional 1d4 bludgeoning damage per object they collided with as the domain pushed them. In case the domain forces them against a wall, they must start holding their breath until the domain is closed or shrinked.

Technique Burnout

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. Right after ending your domain expansion, you cannot use any of your cursed techniques and gain 2 levels of exhaustion for 1 minute.

Lethal Domains

Domains that are expanded to be lethal are constructed within a barrier imbued with the user's cursed technique. The caster's abilities are amplified and any cursed techniques deployed within the domain are guaranteed to hit their target. This sure-hit factor is derived from the barrier's embedded technique, which is what makes this type of domain considered lethal.

Sure Hit Effect

While inside your domain radius, all of your cursed techniques will be affected by a sure hit effect. No matter what your cursed energy attack roll is it will be considered a hit. Creatures will automatically count as having failed saving throws for your cursed technique for the purposes of dealing damage(though not for conditions or additional effects), and your cursed save DC increases by 5. This and any other effects of your domain only apply to targets that you choose inside it. Additionally, the range of any cursed technique feature is expanded to cover the entire domain, even if it is normally touch range.

Non-Lethal Domains

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.

Peace Treaty

While inside Non-Lethal domains, no kinds of violence are allowed while a condition is not completely followed through. After the condition is completed, the domain will end early and you do not gain Technique Burnout from it ending in this manner.

Anti-Domain Clash

Because your domain has a peaceful condition, you cannot open it while another domain expansion is active, however lethal domain expansions cannot be opened as a reaction to your domain opening. You may use your reaction to open your domain against a lethal domain, in which case the clash is different. The domain with more refinement points instantly destroys the other. In the case of two non-lethal domains opening, the one with more refinement points will instantly win.

Domain Refinement

As every technique Domain Expansion gets better with refinement and specializing. A refined domain and a normal domain are very different, while on the second case most semi-grade 1 or above sorcerers could escape, a refined domain can bring trouble to even special grade sorcerers.

Refinement Points

The longer you refine your domain, the more it's refinement points will grow. You will start out with 1 refinement point, which defines diverse things about your domain. Your refinement limit is 1000 refinement points, only the elite of the elite have ever reached said point.

Refinement Benefits

The more you refine your domain, the more versatile can you make it. Depending on your refinement points, you will gain the following benefits:

Benefit	Description	Refinement Points Needed
Domain Durability	Your domain will increase in it's durability the more refined it is. Your domain hit points is increased by +1 for every refinement point you have.	1+
Barrer Resistance	The stronger is the barrier of a domain on the inside, the weaker it is on the outside. You have realized this, and has found ways to go around it. As part of expanding your domain, you may decide if you want to make your barrier have vulnerability on the inside in exchange for it being resistant to all damage on the outside. In addition, you may spend additional 5 cursed energy when expanding your domain to make it perfectly balanced, making both outside and inside have no vulnerabilities or immunities.	100
Quicker Expansion	With lots of training, you have learned how to use your domain handsigns with more efficiency. Your domain now costs an action instead of a full round action.	200
Increased Potency	While inside your domain is where your techniques are at their strongest. While inside your domain, your cursed techniques and domain damage if any have additional dice equal to your Charisma modifier.	300
Domain Amplification	You have learned how to utilize the power of a domain, without actively using it. As an action for half as much Cursed Energy your domain requires, you can cover your body to "wear" your domain in order to neutralize cursed techniques for 1 minute. Once activated, you automatically negate any defensive technique, offensive technique, or spell, that affects you, and you can bypass barriers such as infinity. In addition, you can not use your Innate Technique unless you dismiss Domain Amplification as a bonus action. Even if you dismiss it, for the minute you can reactivate it as a bonus action without spending the cursed energy again. This technique does not work against techniques on Maximum Output or with a cost of 10 or more cursed energy before reductions if the user has 51 or more higher refinement than you. If they are within 50 refinement of you, you have resistance to their technique, and if they have 51 or less refinement than you, you are immune to their techniques even if they use Maximum Output or a technique of sufficient cost.	400
Lasting Domain	With great practice, you have learned how to make your domain last for far longer than it normally would. Your domain now lasts for 2 minutes instead of 1.	500
0.2 Domain Expansion	You have learned how to expand your domain so quickly that almost no one can react to it. As part of opening your domain, you can make it last only until the end of your turn. The cost for this domain expansion is halved, and it cannot be reacted to unless if the creature has a higher Dexterity score than your Charisma score. When opening your domain this way, all creatures inside it will be targeted by it's effects, you don't have the option to choose.	600
Efficient Expansions	It is no secret that opening and maintaining a domain is a very complicated job, requiring lots of cursed energy quantity, practice and refinement. You have refined this with training, reducing your domain expansion cost by your Charisma modifier. In addition, you only gain 1 level of exhaustion after your domain is over.	700
Durable Barrier	Your domain barrier has become hard and quite unbreakable, making escape or forced entry almost impossible. Your domain will gain immunity to non-magical damage from both sides, however it will still be resistant to all damages from the inside and vulnerable to all damages from the outside. In addition, your domain's refinement points are doubled when calculating your domain's hit points.	800
Compression	You have found a method to make your domain take up less space while making it harder to hit from the outside. As a bonus action while on your domain, you can spend 5 cursed energy to compress it, making the outside become a small circle of 5ft. Inside however, will have the same size. Attack rolls against your domain on the outside are made with disadvantage, while barrierless domains must use this feature to target your domain on the outside. This lasts until the end of domain.	900
Mastered Domain	You have reached the pinnacle of Jujutsu, mastering domain expansion. You have mastered your domain handsigns, and may expand your domain as a bonus action instead of an action. You may reduce your domain expansion's cost by your proficiency bonus, and while inside the domain techniques that use an action can now be used as a bonus action, and techniques that take a bonus action can now be used as a free action. In addition, your domain now lasts for 3 minutes.	1000

Additionally, if you have the Reverse Cursed Technique feat and a Domain Refinement of 950 or higher, you gain the following feature:

Burnout Recovery. You have realized the complicated issue with Technique Burnout can be solved in a very simple fashion. You only need to substitute your brain for a new one! Whilst under the effects of Technique Burnout, you can expend 8 cursed energy as a reaction to regain your Cursed Technique and remove the exhaustion gained from burning out. Every time you use this feature, you must succeed on a DC 5 Constitution saving throw. On a success, you regain your Cursed Technique without major consequences. On a failure, your eyes and nose start to bleed profusely as you take 8d6 psychic damage and cannot take actions or bonus actions until the start of your next turn.

The Constitution saving throw DC increases by 5 for every success, being reduced by 5 for every minute that passes, and returns to its original DC at the end of a long rest.

Ways of Refinement

There are multiple ways of refining your domain, from training with yourself to clashing with other people's domains. Down bellow is to list on how to gain refinement points:

Method	Description	Refinement Points Gained
Training	Probably the slowest method, but every little progress counts. Once per day, you can spend 5 cursed energy to refine your domain. These Cursed Energy can only be regained at the next day. Although this method has a flaw, which is that you can only refine your domain alone so much. Upon reaching 500 refinement, you can no longer use this method to refine your domain.	1
Domain Casualties	One of the quicker methods of refining your domain is to destroy opponents with your cursed techniques while inside it. If you reduce a creature to 0 hit points while it's inside your domain expansion, you will gain refinement points. The refinement points are only gained if the creature's cr was at least half of your Jujutsu Sorcerer level(rounded up).	5 per creature
Domain Supremacy	The best form to refine your domain is to just subjugate another one with your own. If you win in a domain clash, you'll gain refinement points from your domain superiority. You may only benefit from this once per singular domain.	20 refinement points

Breaking a Domain

A domain viewed from outside, source [2]

Although Domain Expansion is a extremely powerful and refined technique that only the highest graded sorcerers possess, it can still be broken with enough force.

Barrier Hit Points

Your domain barrier has immense durability, being able to resist even the most damaging attacks. However, cursed imbued attacks can actually pierce through your barrier, despite not being very effective unless done from outside. Your domain barrier has an amount of hit points equal to 100 times your Charisma modifier + your refinement points. Your barrier AC is equal to your cursed energy DC. Your domain barrier has immunity to psychic damage.

Weak Spot

All kinds of barrier techniques have a weak spot, domain expansions could not be different. You can only deal damage to a domain's hit points once you've found it's weak spot, unless you're from outside the domain.

From Inside

Breaking a barrier from the inside is almost impossible, even if you do find the weak point of the barrier you'll still can be targeted by the domains' constant effects. To break a domain from the inside, you must find it's weak spot first by making a DC30 Perception check. On a failure, the target cannot find a weak spot. On a success you will find the domain's weak spot, now being able to target it for your attacks.

From Outside

While breaking a barrier from inside is nearly impossible, breaking from the outside is a much easier task. You may target the domain for your attacks. It automatically fails any saving throws, and it is vulnerable to every kind of damage you deal but psychic damage.

Forming a Weak Spot

Sometimes, even though it may seem disadvantageous you can forcefully enter a domain expansion by creating a weak spot, generally a hole of some sorts. After you have reached at least 1/3rd of the domain's maximum hit points, you can take a action to make a Strength or Charisma saving throw to forcefully open the domain. On a failure, the domain won't have a hole on it. On a success, you will form a 10ft. by 10ft. hole in the domain that allows you and any creatures to enter inside the domain. The moment any creature enters the domain they will suffer the effects of the sure-hit.

Domain Battle

A domain clash starts, source [3]

Two domains expanding at the same time cause a domain clash, a battle solely defined by who has the most refined domain and the most talent as a sorcerer.

Domain Clash

Once a creature expands their domain, you may use your reaction to expand your own domain as well. The domain battle will be defined by the one with the most refinement points, being the defining factor in deciding the winner. However, even if you do have refinement points to destroy the opposing domain it will take a number of rounds equal to the amount of refinement points that you have above the opponent's domain. See the table bellow to see how much rounds it takes:

Refiment Points Above	Rounds Needed To Overlap
10	9
20	8
30	7
40	6
50	5
60	4
70	3
80	2
90	1
100	0

While on the domain clash, the sure-hit effect of both domains will be negated. The domain expansions will create an 350 ft. area, where 175 ft. of it will be with one domain's area while the other 175ft. is for the other domain. The loser's domain area will shrink by 15ft. per round passed. Right after you break the domain, your sure-hit effect will come back into action.

Equal Refinement Domain Clashes

The two strongest sorcerers in history clashing their domains, source [4]

Although an extremely unlikely scenario, that's almost impossible to happen in normal standards, when the top of the world fights this god-like scene might bestow itself to the eyes of outside viewers. When two Domain Expansions of equal refinement clash, they completely nullify eachother, not being able to overpower or be overpowered, so it's up to the two sorcerer's to maintain their domain while bringing the opponent's down. As soon as one of the domain casters reach 1/3 (rounded down) of their maximum hit points they need to succeed in a DC 15 roll with no modifiers to maintain concentration on their domain. On a success, the domain is kept stable and they can keep going. On a failure, their domain breaks, giving in to the opponent's, and they suffer the after effects of Burnout from Domain Expansion.

Multiple Domain Clashes

A battle of two domain expansions is already hard to describe, now one of three or more... When three or more domains are involved, the rules are the same, with the domains with less refiniment being destroyed as soon as the necessary rounds passes. The barrier is expanded by 175ft. per domain involved, with the weaker domains getting reduced by 15ft. at the beggining of each round.

Barrierless Domain

You have refined your domain expansion to new levels, making it become a true work of art.

Different Properties

The king of curses using a barrierless domain expansion, source [5]

When you expand your domain, you may choose to not get a barrier up and remove the time limit. Your domain expansion range increases to 655 ft., and it has a center at the middle. Your domain cannot be destroyed unless you receive 1/3rd of your maximum hit points in damage, in which you must make a DC15 + half the damage taken Constitution saving throw. On a failure, the domain is destroyed. Your techniques are still sure hit effect, however due to not having a barrier your domain is much simpler to escape. Also on a domain clash, your domain effects and cursed techniques can target the outside barrier of the other domain directly.

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