Background data: -I am writing a fantasy novel series of which I am presently on the first book. -Each book will have different a different antagonist from a group/kingdom - Each group will be introduced in the book prior. So I am presently introducing a new character/group to my book, they have a small part in this book but they will play a major part in the next book. I am trying to figure out how to bring this character in , causing the main protagonist a great deal of stress and worry but steal down play them enough so they don't have to have a major role in this book. So far I have talked about the new antagonist in one chapter and have kind of left it as the main characters know what it is but not who. Now the problem is I feel like I am just dropping that part of the story like it is an added detail that won't be picked up on or will be confusing to the reader. Any tips are appreciated, thanks.