Yao Guang can't see Stelle's future
Seems like Yao Guang has the power to see the aura of fortune around anyone with a simple look thanks to her power called "Eye of Isvara", but she's completely unable to see anything for Stelle. This seems to be connected that she's the "wild card" that even Destiny's Slave want to keep around to achieve his plan. According to her Stelle's very presence becomes a variable in whatever situation she's into and it's not really a consequence of her witnessing Terminus. More like she was able to witness Terminus BECAUSE she's that variable.
Yao Guang is trying to defy the destiny she calculated (basically the fall of Planarcadia) by adding more and more variables to the "Phantasmoon Games". That's why she put the mask on Sunday (forcing him to participate) and is acting more erratically than she normally would. Her primary objective remains the alliance between IPC and Xianzhou alliance against the Destruction, but she doesn't want other things to impact this plan. (Blade presence seems to be something she is convinced of)
I love how she sees that Fugue has an aura of absolute luck as a rebound of all the misfortune she got up until now. It's sort of a cosmic karma to allow her to have it easy now and I have to say it, she deserves it.
Talking a bit more about Yao Guang, I have to say that her design is outright gorgeous. She's the "femme fatale" design of hoyoverse games, but her face has something that puts her outside of the other beauties we got until now (Ruan Mei, Himeko, etc...). She's more mysterious maybe? It's something to do with her eyes I feel. I usually like cute designs more, but she's definitely near top tier character visually for me.
