@givemersspls@ApolloX1209 That's what happens when they try to sum up 4-5 chapters (roughly 20k characters) in a few paragraphs, especially when it contains ambiguous content in the first place. I'm not going to break it down because it ruins it for those who want to read the novel. There's too much to word (read: lazy) -- not to mention discussing its significance. They might even have to change the story as they're going to pass the author in no time at this pace.
I believe he will be the last boss. So he will appear after most big chapter. Collect either the main villain or the artifact and vanish again. In the novel he appears after this trial