This phrase appeared after the system called Brushel was mentioned. Of course, since Lyla had copied down the engravings on the burial site bit by bit, they were missing some words in between. However, the spaces between the missing words were short, and it seemed fully reasonable to think that the phrase was talking about the Brushel System. 

“Do you think that phrase is talking about the limits to the regressions?”

“Yeah,” Lyla said. Zich looked at the writings again.

“With just this, it’s hard to tell what this limit is.”

“That’s true. We don’t know if there’s a limit in the number of times you can regress, such as if the regressor undergoes some changes, if it leaves some kind of effect on the world, or if it has a completely different side effect.”

“That side effect could be me regressing instead of Glen Zenard.”

“That could also be a possibility.”

“Hm.” Zich stared at the words that seemed to warn about the limits of regressing and turned his gaze towards the words "Brushel System".

‘So, is this the name of the thing that causes regression?’ They had simply found out the system’s name and didn’t know what the system exactly was....