Die? Is that when he meets Orsted? The only human who could take on Orsted could perhaps be that one ridiculously strong guy from the future which name I shall not provide. Rudeus will not die.
First: you want a spoiler, so put it in the spoiler section Second: the novel is already finished, if you want spoilers look through the original Third: the manga probably has differences from the original, so why ask on the novel discussion, there is a forum for manga topics on this site too.