[zodanhko]

Originally Posted by Used Can

Sometimes I think Ryner was meant to end up with the Lonely One within him.

From the spoilers above ...

Spoiler for spoiler:

"Created the axioms of this world with the exception of the Lonely Demon, of whom not even the Shisai know when was created nor purpose of existence, hence they are cautious of this entity."

...and from what you said, perhaps the purpose of the existence of the Lonely One was to become one with Ryner.

Spoiler for question:

In Volume 6 of the sequel, did the Lonely One awaken when Ryner obtained the SoAE?