The boy grows into a storm.
By thirteen, Sukuna no longer learns jujutsu—he rewrites it. He studies ancient scrolls, tears them apart, and reconstructs techniques with his own twisted logic. Where others bind curses, he bends them. Where others purify, he corrupts.
He sits cross-legged in a cave of obsidian, surrounded by cursed spirits that whisper in languages older than death. His fingers trace sigils into the stone, each one pulsing with raw, unstable energy. He doesn't flinch when they explode. He laughs.
The sorcerer clans begin to take notice.
The Kamo clan sends an emissary. A proud man with a bloodline technique and a sword carved from his ancestor's bones. He kneels before Sukuna, offering alliance.
Sukuna rips the sword from his hand and drives it through the man's chest.
"I don't kneel. I don't ally. I consume."
Word spreads. Sukuna is no longer a child. He is a force of nature wrapped in flesh. The jujutsu elders convene in secret, debating whether to name him a calamity or a god. They settle on neither. They call him "The Aberration."
But Sukuna doesn't care what they call him. He's building something.
In the ruins of a forgotten temple, he crafts his first Domain. It's crude, unstable—a swirling vortex of bone, flame, and ink—but it holds. Inside, time bends. Gravity twists. Curses sing.
He names it Malevolent Sanctuary.
It's not yet the perfected version that legends will speak of. But it's enough to draw attention.
A trio of elite sorcerers descend upon him. One wields shadows. One manipulates sound. One controls blood. Together, they are meant to be unstoppable.
They last seven minutes.
Sukuna dissects their techniques mid-battle, mimics them, and turns them against their owners. He doesn't just kill them—he learns from them. Absorbs them. Evolves.
After the battle, he sits atop their corpses and carves a new symbol into his chest—a mark of supremacy. Not granted. Taken.
"If jujutsu is a language," he says, "then I am its scream."
The clans retreat. The elders panic. And somewhere in the capital, a young Gojo ancestor watches the sky darken and wonders if the Six Eyes will be enough.
Sukuna doesn't look back.
He walks into the heart of Kyoto, alone, and declares war on the jujutsu order.