C341 Afferent fetus

What could it be, some kind of Gu worm? Why did it come out of his body, and why was it able to move his life?

Was this Yan Shouguan's last life-saving measure?

I feel these auras in his dantian, I keep having the feeling that this thing in his body, seems to be even stronger than Yan Shouguan himself.

If it was Yan Shouguan's life saving technique, logically speaking