I think there should be a thread for spell-related questions, because I have one and I feel sort of bad starting a new thread for it. But here goes.

The Severing Charm - Diffindo - is only cited as being used on material objects, with the exception of the tentacles attacking Ron in OotP. Do you think it could be used as an offensive spell in battle? I would like to use it that way but want to make sure someone else thinks it's possible. It would obviously be similar to Sectumsempra, except that spell is Dark Magic in that anything cut away from a person does not grow back (such as George's ear.) But I don't want Dark Magic, so I'm planning on Diffindo for my duel. Does that sound like it will work or is there something better?