Wall of Heart-Sounds

The starship settled before the Eleven-Fold Rhythm Stele in Konoha Omni-Dimensional Plaza. The faint light of the Primordial Beings, the aura of common origin from the Lost Lineage peoples, the pure ripples of newborn life, and the chakra rivers of the Shinobi World wove together into a soft sea of light. The Stone of Common Origin in Boruto's palm was still faintly warm, and the Eleven-Fold Resonance flowed around him like breathing. His Jōgan looked toward the horizon, only to brush against a barrier at the very edge of the Omni-Dimensional Symbiotic Net unlike anything that had ever been there before.

It was not a power of distortion, not Ji Wu, not Severance, but a wall condensed from countless tiny fragments of thought. It was as thin as a cicada's wing, yet indestructible, wrapping an entire dimensional territory tight. There was no hostility on the barrier, only endless silence, confusion, and self-imposed isolation.

Mitsuki closed his eyes, and his Gap Net perception spread along the Symbiotic Net. A trace of pallor soon rose on his fingertips. The instant his Sage Chakra touched that barrier, it was drowned by countless chaotic yet pure heart-sounds. Those heart-sounds had no language, no emotion, only the most instinctive resistance—resistance to connection, resistance to encounter, resistance to all outside contact.

"There are living beings from an entire dimension in there," Mitsuki said slowly as he opened his eyes, his voice carrying a trace of gravity. "It's not that they don't want to connect. They don't know how to connect. They've existed alone since the moment they were born. No people, no companions, no concept of communication at all. For hundreds of millions of years, they've lived only inside their own consciousness, until they finally trapped themselves inside the Wall of Heart-Sounds."

Sarada's Eternal Mangekyo Sharingan