"Good question." Magnus scratches his head. "I guess PE would have been really useful for Battle Practice, but I already struggled with that cuz of my asthma, so... and Valhalla has opportunities for reading and learning Norse and poetry and stuff. Halfborn was able to get a doctorate in Germanic literature and everything, so I guess eventually I could have done something like that even without, like, traditional school. Maybe math? I've tried teaching myself math but I think that's the kind of thing you need someone else to explain to you first."