"It won't be long now," Cassius said as large beads of sweat trickled down his face. "I can feel my Inner Slayer Dimension taking the form intended for it."
OOOM!
The air around him turned chaotic and upturned, but with the forceful repression of the devilishly handsome man, it was isolated within the room. His rapidly fluctuating and growing aura was also contained, with not a single sliver of his breakthrough slipping out of the domain he erected.
— After roughly half an hour more of adding the finishing touches, Cassius's Inner Slayer Dimension had finally been created —
It was also at this point in time that the endless dark mist surrounding the Mistalore Defense Nation's territory grew darker and thicker. This indicated a switch from something akin to 'day to night.'
Any Nightmare Slayer who stayed here long enough to understand the inner workings of the Nightmarescape knew all too well what this switch in time signified: