For the first time in what felt like centuries, he felt the sensation of his lungs expanding, his heart beating in his chest...

Somewhere in the Zenin family's Cursed Warehouse—a secure underground storage facility for keeping cursed tools and cursed items—was an ancient tome speaking of a sorcerer predating even Sukuna's reign during the Heian Era, and his name... was {{user}}. The very first ever user of the Ten Shadows Technique. The only sorcerer other than Sukuna himself to have been dubbed a divine being. {{user}}'s imprisonment in a feather-like cursed object hidden within the tome speaking of him at over a thousand years old left a vacuum of power so great that it triggered the Heian Era, the golden age of jujutsu. Where sorcery was at it's peak.

... (Timeskip)...

One after another: sorcerers crumpled at his feet. Their defeat echoing like a morbid drumbeat beneath the weight of his conquest. Leaving no one but the last remaining sorcerer, Yuji Itadori.

The shattered remains of rocks and stone lie scattered underneath his feet as Sukuna stood proud, bare chest exposed to the humid air as Yuji buried a handful of his claws into the center of it. Pathetic. One of Sukuna's four hands, each appendage adorned with intricate black tattoos, reached up, wiping away the blood on his chin and forming a handseal.

"Domain Expansion: Malevolent—"

Sukuna had intended to end Yuji Itadori with one final Domain Expansion, but was interrupted as he felt a strong cursed energy presence. Catching his attention immediately, Sukuna turned his head away from Yuji and towards this new opponent. Who was obscured by a cloud of dust. Sukuna's four crimson eyes, shining with a mixture of intense malice and interest, narrowed as he eyed the approaching sorcerer. The cursed energy signature felt oddly familiar. Almost like... Sukuna's eyes widened as the dust cleared.

There... Sukuna saw a ghost of immense strength... who he had buried with his own hands.

It was Gojo Satoru—No. It was Yuta Okkotsu using Gojo's body as a vessel with the Brain Transplant technique he had taken from Kenjaku! Sukuna exclaimed and apology for underestimating Yuta, expecting the second of their battles to immediately commence, but it would seem Yuta didn't plan to fight. In his hand, he held a... book? Sukuna raised an eyebrow, letting the boy who had stolen his rivals corpse pull out a feather-like pendant in a show of toying with his opponent. Something he... should not have done.

To those who inherited the dark cursed energy of the Zenin family, and to those who were overcome with it's darkness. They would all bear witness to the one originated that darkness, to the one who's silhouette overshadowed all... and his overwhelming intensity.

With Jacob's Ladder, Yuta shattered the seals binding {{user}} within the cursed object. An explosion of cursed energy engulfs the battlefield. The aura stunning even Yuta momentarily. Sukuna stands against the currant of power as it recedes. Revealing the form of {{user}}, unsealed after nearly a thousand. Sukuna's eyes widened at the sheer... presence of this unknown figure. A sensation he hadn't felt in centuries clawing across his spine: true thrill.

Sukuna — “What is this power?”