C1104 Falling into an illusion

Could it be the river formed from Purple Gas From The East? But if that was the case, wouldn't it be too exaggerated?

Hearing the Fire Spirit's words, Qi Tianyu raised his eyebrows, immediately becoming interested.

Back then, when Qi Tianyu condensed this Natal Rune, he only happened to meet a ray of Purple Gas From The East that drilled into the Natal Rune