Kapitel 313: 5.12.1 Its the start.

The drops on the floor were minute, most of them were in crevices of the tiles, barely visible to the naked eye. But Crow had an epiphany instantly seeing this. 

Before Sheva could approach, he made a small cut on his arm, letting the blood drop onto the same floor. 

"Sacrifice." He said, and like Sheva had contemplated before, it really was the answer to their problem. By the time Sheva and Henry came to Crow's position, they could see the fallen blood moving on their own, getting absorbed by the floor. 

"What now? Do I need to bleed more?" Crow asked Sheva, who looked at him with some surprise before she looked at the floor again. "I…" 

But before she could say a thing, the floor under their feet trembled and then started to split apart one by one, causing the trio to move out of the way as they saw the magical scene in front of their eyes.