Unlimited Void

Unlimited Void is Satoru Gojo's domain expansion using the Limitless.

Description
This Domain Expansion brings the user and their targets inside the Limitless itself, a vast void of infinite knowledge. Boundless raw information floods into the target's mind, overwhelming them to the point where they're completely immobilized. Alongside Self-Embodiment of Perfection, Nanami called Unlimited Void an almost-guaranteed win once it ensnares its target.

The complete incapacitation of the target is caused by a phenomenon where the target will be able to see and feel everything while not being able to see or feel anything at the same time. All the actions one has taken in their life is forced upon them infinitely and they can't do anything but die slowly. This effect does not affect the user or anyone they're touching.

Usage
Unlimited Void is one of, if not the most advanced technique in the arsenal of the Limitless. Satoru Gojo inherited the Six Eyes and likely mastered his Domain Expansion after awakening his full potential after the Star Plasma Vessel escort mission. He first displayed his mastery over his domain when he used it to counter Jogo's Coffin of the Iron Mountain. Unlimited Void was the more refined of the two domains and easily supressed Coffin of the Iron Mountain.

Being trapped inside the Limitless left Jogo in a complete trance, to the point where he couldn't move at all and could hardly think clearly. He could only think of how he was helpless due to the endless information invading his mind. Satoru divulged how Unlimited Void forces one's actions upon them infinitely and noted how it was ironic how the target is given everything and yet unable to do anything at all.

When Kenjaku was explaining his plan to seal Satoru with Jogo, a part of their strategy to use non-sorcerers to hinder his techniques was meant to prevent Satoru from casting Unlimited Void at all. They assumed Satoru is skilled enough to exclude anyone he's not targetting from his domain. However, doing so during the Shibuya Incident could've crushed the bystanders between the domain's barrier and the curtain trapping Satoru. Kenjaku was 99% sure Satoru wouldn't cast his domain and reminded Jogo that no one on their side could cast theirs either as that would leave Satoru no choice.

During their actual fight with Satoru, Mahito and Jogo were confident their adversary wouldn't sacrifice the bystanders' lives to cast his domain. Although Satoru could have exorcised every curse with Unlimited Void, everyone else would've died too. Instead, Satoru surprised everyone and activated an all-or-nothing Domain Expansion of just 0.2 seconds. The time frame was just a guess that Satoru made, figuring that a non-sorcerer could only last 0.2 seconds within the domain without suffering aftereffects. The amount of information that everyone was exposed to was about half a year's worth, leaving everyone unconscious while still standing. This level of the domain could've allowed the cursed spirits to awaken from their trance at any moment, so Satoru focused on eliminating all one thousand of the transfigured humans targeting the civilians in just 299 seconds.

During Satoru's duel with Sukuna, the two of them eventually activated Domain Expansion after various well-matched exchanges. Unlimited Void proved to be as equally strong as Sukuna's Malevolent Shrine, but Malevolent Shrine's range proved to be significantly greater and it's open barrier nature allowed it to destroy Unlimited Void. After Satoru recovered his cursed technique in a vicious exchange where he managed to fight off Sukuna long enough for him to escape Malevolent Shrine, Satoru proceeded to expand Unlimited Void again, this time revealing he had the prowess and genius to change the conditions of his domain, switching the internal and external condition of Unlimited Void to reinforce the outer shell, making it especially strong against attacks that come from outside of the barrier. At first, Unlimited Void held out long enough for Satoru to engage in a fierce bout of hand-to-hand combat with Sukuna, but Sukuna responded by changing Malevolent Shrine's condition to remove it's guaranteed hit effect and strengthen it's power to destroy Unlimited Void from the outside again.

Now well-prepared for the scenario, Satoru, after using Falling Blossom Emotions to survive Sukuna's initial must-hit attacks, proceeded to activate Unlimited Void once again, this time using the knowledge gained from his time trapped inside the Prison Realm to narrow his domain's outer shell down to the size of a basketball, which was even smaller than himself, further increasing the toughness of the barrier. Although this was countered by Sukuna narrowing down Malevolent Shrine's effective range, Unlimited Void proved able to withstand Malevolent Shrine long enough for Satoru to injure Sukuna and thus, both of the domain collapsed at the same time. After a brief exchange, both Satoru and Sukuna yet again activated his Domain Expansion for the fourth time, and Satoru once again proved able to damage Sukuna enough to dismiss the Malevolent Shrine. In their fifth exchange of Domain Expansion, Sukuna was late in expanding his Domain just for 0.01 seconds, but that was enough for Unlimited Void to land, weakening Malevolent Shrine's sure-hit effect and Sukuna and allowing Unlimited Void to finally overcome Malevolent Shrine, causing it to collapse and forcing Sukuna to take the full brunt of Unlimited Void, forcing Sukuna to summon Mahoraga and destroy the Unlimited Void before Satoru could take down the Shikigami in one-shot.

Sukuna revealed that he had Megumi's soul take the brunt of Unlimited Void so as to help the process of adapting to Unlimited Void for Mahoraga to save him, but while having replenished his burnt-out cursed technique with Reverse Cursed Technique proved too much for Satoru to activate Unlimited Void for the sixth time, Unlimited Void also managed to previously damage Sukuna back before it was destroyed, damaging Sukuna's brain to the same level as Satoru and making him unable to cast Malevolent Shrine.

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