In [[Tabletop Role Playing Game|TTRPG]]s and [[Writing]], one of the easiest ways to deal with other (friendly) characters that could just "solve all the problems" for the main characters is to have things happen that *only they* can properly deal with. We see this in Marvel movies constantly, especially the Avengers movies, where there's a massive difference in power between some of the characters, yet while they're all fighting each has a problem proportional to how strong they.