Key Knowledge!

"Did you guys just see that?"

Tevenlor pointed at the wall, revealing its secrets to his new masters.

"This wall's not real, just an illusion that you can't walk through unless every inch of your body is covered in Force. This drawing that you see on it is actually a magic circle drawn in empty air. The illusion that there is an unsurpassable wall here originates from it."

Roy gaped at it in silence. What the fuck was he hearing and seeing?

"Magic circle can be drawn in empty air?!"

Tevenlor replied to Roy, "It's not easy, almost close to impossible."

He raised one finger and added, "One. That's the number of people who could do it. That very person created this. It's so strong that not even Voss could see through it."

Roy scrutinized the painting. He already knew that he couldn't inspect it, but he could at least try to memorize it. Unsurprisingly, even that was hard and life-threatening.