"But what has the baby got to do with the Main World-Lines?"
"That... even I do not know of. My spell probably malfunctioned."
"Huh? As I recall, you said that there are Four Main World-Lines, two of which were since the very beginning and two others that were given birth to, isn't that correct?" I repeated his words in attempt for clarification.
"Yes, that is correct. Elias's and Helis's worlds are the first Two Main World-Lines which are basically copies of each other. Elias's World Line sprouted first, then Helis's, whose essence was taken from the very First World-Line, where the fact that Helis's life is very similar to Elias's besides the small differences here and there. That's the fact that proves so.
