A certain foolishly romantic part of me will not be satisfied unless we get to see the huge fight from the end of Deadly Hallows, only with Chaos Army using a mix of weaponized Charms and flash-Transfiguration of Muggle weapons. Of course that's completely inappropriate for MoR, as HPEJV would, if it came to that, just resort to saturation-bombing with transfigured nukes or whatever. Assuming he couldn't use nanotech or some kind of ID-targeted curse or something else less... hollywood.