Cetra. It sounded like a term that Sephiroth should know, but didn't. He was certain he had read it somewhere before but couldn't, off the top of his head recall what exactly it had been in relation to. The corner of an eyebrow twitched in what could have been a renewed frown if he had let it develop that way.

Still, he listened in silence to Genesis as he continued. Expertly compartmentalizing all thoughts regarding it into the importance of getting to the bottom of their existence in the realm of Crystallis and purposefully not allowing it to bleed too far into what his existence had been back on their own Planet. However, it still concerned him- from how Genesis were describing it, things would get a lot worse for all of them in the future.

"You're right. There are many connections between various worlds made obvious by the fact that there are several represented here. It's no surprise really if you think about it logically; common elements run through all planes of existence."

All that Genesis had said turned an uncomfortable knot within Sephiroth all the same. The correlation was too stark to be ignored.