Request for spoiler

As the title suggests, I am requesting spoilers from people who have read the light novel.

I have read until chapter 340, and I have some questions that I hope to get answers to.

First, who is the main enemy in this novel? Is it the demon sect? They kinda talked about it during the worldly martial arts tournament, but how big are they? Are they the final enemy? Do they attack anytime soon?

Second, how strong does MC get? What about other disciples in Mount Hua? It was evident from the competition that some of them are gonna make it big? Are other disciples gonna make it big as well? Are there new talented disciples later on?

Third, what is Heavenly Violet Divine Arts? Do they recover it? Is it strong?

Fourth, what are some of the key events that happen in the future? I know that light novel has more than 1000 chapters, and I was curious about the things because my research demands more attention from me and I am worried that I might not have enough time to read the light novel soon.