La Signora: I Will Use My Life to Protect Your Love

How did this 'Dreamy Musou' end up in Bai Ye's hands?

Could it be that he stole Raiden Ei's sword?

No, no, no, that's impossible.

Rosalyn dismissed the idea in her mind after only a moment.

Rather than believing that Bai Ye could steal 'Dreamy Musou' from Raiden Shogun and still get it to Liyue without any problems, it's better to believe that Bai Ye's experience was correct.

After facing Zhongli, Rosalyn gained a deeper understanding of the power of the gods. It was because Barbatos felt guilty that he had held back when she faced him; had it been any of the other Seven Archons, she feared she would have perished in a single blow.