Celeste mastering the "World's Wound" spell greatly shocked Ybur, but after thinking about it, it seemed reasonable.
At the moment, it's only "half a Ninth Rank," but even at the instant of advancing to the Ninth Rank, there was a feeling of cloud-clearing revelation. So, what about Celeste?
Mastering a spell is, of course, not simple, but after all, the spell was created by Ruby herself. Although Ruby loves whimsical adventurous strategies, she's indeed a good teacher in terms of teaching, thoroughly dissecting her thoughts and insights to convey to Ybur—previously, Ybur didn't understand because he hadn't experienced that "divine perspective."
Furthermore, Celeste actually has a hidden advantage that even she might not be aware of—the essence of the World's Wound spell is mobilizing the underlying roots of three worlds, and Celeste has already gained the Abyss's recognition, with part of the Abyss's laws opening to this nascent Demon Lord.
