I've seen this in a few places and I think classcraft team may be working on it, but I wanted to still suggest (just in case) including battles in quest lines. They can be scaled down, much like you would have in an RPG. Like "slay this many creatures" and then they do it by answering questions. Or they have to defeat one strong creature with multiple questions.
It could even be a cliffhanger and they have to submit an assignment and the teacher has to grade it to see if they defeat the monster. I know that's a lot of work on the teacher's end, but I'm obsessed with including this class next semester.
Hope this helps!