The largest room in the Fourth-Dimensional Apartment.
An endless expanse of plain white, without a single piece of furniture.
A smooth, matte gray-white floor stretched into the distance. Equally bare white walls rose to meet a hazy white dome. There was no sun or moon. Soft, even light filled the room, making day and night impossible to tell apart.
It was frighteningly quiet.
No wind. No insects.
In that vast room stood only the Four-Disaster Fusion Monster, which had been dragged inside by force.
The wounds torn open when everyone had hauled it into the room were already writhing shut. Black flesh churned, joined, and re-formed, while broken layers of bone armor knitted together. As the ultimate fusion of the Four Calamities, it possessed an almost unbeatable power of regeneration.
Even if more than half its body was destroyed, it would never truly fall as long as its fused core remained intact.
In mere seconds, its ruined form took shape again. Its strength surged back, and an aura of destruction on the verge of running wild made the air throughout the room tremble.
Sealed away. Driven out. Locked inside this vast prison made of Nen.
That absolute confinement ignited the last of its savagery.
The monster lowered its head. Dozens of crimson eyes lit up at once, crowding its hideous face. A violent black mist of calamity billowed around its body, sweeping across the white floor and leaving flecks of charred black in its wake.
It waited.
For countless powerful foes to surround and kill it. For torrents of Nen to wear it down. For a slow death.
That was its final prediction before death.
But it never could have imagined this.
Only one person entered the sealed prison.
An utterly ordinary-looking bald man in a plain yellow bodysuit, his