Well, spoilers in light novels related to gamers can be really annoying. For example, if you're into a game - based light novel series and someone reveals a major plot twist about a character's in - game power - up or a crucial event in the game world that the characters are part of. It can ruin the excitement of discovery when you finally get to that part of the novel.
Well, there are some major plot turns in 'A Will Eternal' that you wouldn't expect. However, I suggest you discover them yourself while reading to fully enjoy the story.
Well, the major spoilers involve some unexpected plot twists and character developments. But I really don't want to ruin it for you. You should read and enjoy the surprises!
I'm not sure specifically as I haven't read this novel. But generally, spoilers could include details about the main characters' fates, any major plot twists like unexpected alliances or betrayals, and the final outcome of relationships in the story.