Vortex

Soon, all three of them were sitting side by side, with the slate resting on the table in front of them. Cassie was tracing her fingers across the stone surface, a focused look on her face. 

After a while, she slowly nodded. 

"The coordinates match. It is indeed the right place."

The blind girl was much more proficient in navigating the Great River, considering how much longer she had spent here than Sunny and Nephis. She was also the one who had learned the transcript system of the sybils and pinned down where Effie and Jet were trapped, in the first place. 

"Wind Flower, huh…"

Sunny looked at the slate. There were neat columns of symbols engraved on it, as well as an image of a messy circle with frayed edges. It resembled a vortex more than anything, or maybe a cyclone. After studying it for a few moments, he reached out and turned the slate over.