"With a Strong Foundation and a little bit of sense and imagination, it just takes the slightest trigger to change a person."
- Satoru Gojo
All domains require a specific hand sign for its expansion to be activated, taking a Full Turn Action to activate. 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. The properties of domain expansions, such as range, damage, and other various effects also vary and should be defined upon creation.
A sphere of negative energy ripples out in a 75-foot-radius sphere from the user's hands. Each creature in that area must make a Constitution saving throw. A target takes 12d6 necrotic damage on a failed save, or half as much damage on a successful one.
Your domain barrier has an amount of hit points equal to 100 times your Charisma modifier + your proficiency bonus. Your barrier AC is equal to your spell casting DC. Your domain barrier cannot take psychic damage. A domain barrier takes half damage from all sources from the inside, and has vulnerability to damage from the outside.
Domains that are expanded to be lethal are constructed within a barrier imbued with the user's Casting individuality i.e. a sorcerers bloodline or a warlock patron or a wizard's spellcasting school. The caster's abilities are amplified and any attacks 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. While inside your domain radius, all of your actions will be affected by a sure hit effect. No matter what your attack roll is, it will be considered a hit. Creatures will automatically count as having failed saving throws for the purposes of dealing damage(though not for conditions or additional effects). At 600 refinement or higher you may make this and the sure hit effect of your domain only apply to targets that you choose inside it. Additionally, the range of any feature is expanded to cover the entire domain, even if it is normally touch range. Finally any feature which negates, reduces, or avoids attacks, saving throws, damage, or conditions do not work against a feature affected by this unless it specifically states otherwise. Domains also have a passive effect which they apply called the sure hit effect, if this effect inflicts damage or conditions the domain is considered Lethal, if it doesn’t it is considered Non-Lethal.
Right after ending your domain expansion, you gain 2 levels of exhaustion.
At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the damage increases by 8d6 for each slot level above 6th.
Domain Refinement
As every technique, Domain Expansion gets better with refinement and specializing.
The longer you refine your domain, the more its 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.
| Benefit | Description | Refinement Points Needed |
|---|---|---|
| Domain Durability | Your domain will increase in its durability the more refined it is. Your domain hit points are increased by +1 for every refinement point you have. | 1+ |
| Technique Efficiency | With your technique already infused into your barrier using it becomes almost effortless to you. You may choose to reduce the cost of your spell slots cost for spells level 3 or below to 0 cost while you cast it inside your domain. | 100 |
| Quicker Expansion | With lots of training, you have learned how to use your domain hand signs with more efficiency. Your domain now costs an action instead of a full turn action. | 200 |
| Increased Potency | While inside your domain is where your techniques are at their strongest. While inside your domain, your damage die increase an equal amount to your Charisma modifier, gain a +5 bonus to their DCs and a +5 bonus to hit. | 300 |
| Enhanced Technique Efficiency | With your domain's enhanced potency, the imbued technique's potency is further enhanced. While within your domain, you now reduce the cost of your spell slots at level 5 or below to zero 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 without needing to hold concentration. | 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 creature’s caught inside it must make a Dexterity saving throw. On a failure reacting to this domain takes double the amount of reactions it normally would, while on a success they can react as normal. This save is made at disadvantage unless 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 its effects, you don't have the option to choose. Any of your Domain Expansion's effects that would happen at the start of any creature's turn, be it yours or another creature's, happens immediately when you expand your domain this way. | 600 |
| Efficient Expansions | It is no secret that opening and maintaining a domain is a very complicated job, requiring lots of energy, quantity, practice and refinement. You have refined this with training, you only gain 1 level of exhaustion after your domain is over and the DC to use your Technique while in Burnout is reduced to 25. | 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 |
| Domain Superiority | Your domain is approaching the absolute peak of refinement, a realm where even the smallest imperfections can spell doom. The refinement thresholds which determine how long it takes you to destroy another domain in a clash are halved. | 900 |
| Mastered Domain | You have reached the pinnacle of Jujutsu, mastering domain expansion. You have mastered your domain hand signs, and may expand your domain as a bonus action instead of an action, 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 without needing to hold concentration. | 1000 |
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