Quote:I'm not so sure about this, actually. Sure, Divine Buster looks much more powerful and destructive, but in the first series, Fate survives taking one head-on. The killing curse is just that: if it hits you, you're dead. No ifs, ands, or buts (ignoring the obvious exception), and no known magical shield against it exists. It's not as flashy, maybe, but it's not really possible to get much more effective than insta-death, at least in an anti-personnel role.
Any Harry Potter xover with Mahou Lyrical Nanoha series...
The canon power levels are too great in difference. I mean, a killing curse vs a Divine Buster or a Starlight breaker? Nanoha at 10 can take on Snake face w/o breaking a sweat. At 16-19?..hehe
Also, Midchildan magic seems very centered around energy manipulation, so something like HP-style transfiguration would be an unknown variable as well (though the obvious Nanoha application of transfiguration magic would be the barrier jacket transformation sequence). HP-style magic seems more flexible in general, I would say, so even leaving the killing curse aside, it sets up some interesting "raw power versus adaptibility and versatility" scenarios.
This does happen to be a scenario I'm considering writing after I finish Soul Voice, especially since I've finally come up with a plot that doesn't require time-shifting one of the series' timelines, so I've put a certain amount of thought into it. One problem is that we've seen very few real magical battles in HP, whereas nearly all of the magic shown in Nanoha has been combat magic of some sort, which makes determination of the degree of overlap between them somewhat difficult. Still, if I do decide to try this, it should be at the very least an entertaining exercise in world-building (or -adapting, I suppose).