Prisoner Cursed Technique

The base technique involves the user to be able to summon "prison guards" to help out in their fights, the strongest of which is equal to a special grade sorcerer. However, the cursed energy required to summon them, means that they cannot be summoned unless they are less than half of your cursed energy. The user can also manifest chains, and control any metal in the area to their purpose, however the latter technique requires a boatload of cursed energy to use. The average user is able to use chains efficiently and summon half of the wardens, which there is a max of 20. The strongest of the users of the Prisoner technique, are able to control even the smallest amounts of metal, while producing chains that restrict even the use of cursed energy, while being able to summon all 20 of the wardens.

Locked away since the beginning of time

Cast in chains, trapped like a demon

Empowering them to be truly sublime

Long since dormant but the chains have broken

Domain Expansion: Maximum Security Prison

Inside the domain expansion, the surehit effect is that all who exist within the domain, are locked up and chained up, to the point no movement beyond breathing is possible. This also includes the user, however the user can summon all 20 of the prison guards (regardless of cursed energy required) to beat on, but not kill, those trapped within the domain. The user starts being tied down with 20 chains, and every 5 seconds, his power increases by 112.5%. This effect is stackable to the point of being 10 times stronger than before. Once all the chains are removed, they are unrestricted and can freely slaughter everyone within the domain, including the guards who will try to protect those captured within the domain, as they are "within the prison" and no longer escapees. This buff continues outside of the domain, decreasing to the point of 25% of the power increase becoming their base strength over the course of 10 minutes.

The Wardens Abilities

The first 5 wardens, known as the Grunts are little more than grade 2 cursed spirits, meaning even the weakest of sorcercers could deal with them. However, they have the ability to multiply by 5 for every 10 seconds they are summoned, as long as the summoner has the cursed energy required.

The second 5, known as the Officers are equal to grade 1 curses and have specific abilities

1 has the ability to summon metal bars that he uses as weapons, which is beyond the basic baton all of them are equipped with

2 has the ability to arrest people with his attacks, each strike lowering the output of CE

3 has increased strength, speed, and durability equal to that of a grade 1 sorcercer, however lacks control and needs to be directly controlled by the user

4 has increased intelligence, and uses to strategically control all of the wardens except the last 5, to commit to a battle plan come up by him or the user

5 wields a riot shield which is stronger than any known substance on earth

The last 5, which are the Wardens are equal to special grade sorcerers, and with each rank they increase in Power

Rank 5 has all of the abilities of the officers

Rank 4 wields chains that restrict cursed energy usage and nullify cursed techniques, along with physical stats superior to those of Rank 5

Rank 3 wields a near infinite amount of firearms, and is very skilled, to the point only the strongest sorcerers could stand up to him, while also being stronger than Rank 4

Rank 2 is physically superior to the rest, while being donned in riot armor, that protects him against even the strongest of attacks

Rank 1 is the strongest of them all, wielding every single power of those below him, and having power equal to that of Mahoraga, while growing stronger during the fight, costing an insane amount of cursed energy
The user can use binding vows to obtain the powers of the Officers and Wardens except Rank 1, with the consequences of no longer being able to summon them

An additional binding vow, seperate from the cursed technique is connected to the domain. Outside of the domain and before the buff is applied, the user must stay within a straight jacket used for the most dangerous of prisoners. This restriction is exchanged for doubling the effects of the chains inside the domain for the user, while also draining cursed energy from those within the domain to also buff the user

In short, the strongest Prisoner Technique user, could summon an ever growing army of men and having a right hand man who is ever growing in power. While also having one of the most broken domains in the verse, and if the domain isn't interrupted, could surpass even the likes of Ryomen Sukuna and Satoru Gojo.