Dorcas and I have been wracking our brains, but we can't think of any spell that would cause long-term petrification like that. And I really don't know of any spell that affects the victim differently depending on their blood status. So as to why Dennis was killed and the Olivander boy was petrified, I'm afraid we don't have a clue. We've checked our miniaturised library of auror-training textbooks, too.
Dorcas remembered that the Hogwarts library has some books in the Restricted section which you might try: take a look at Speed and Silence: Effective Defensive Spells for Combat Situations by Featherstone and When Seconds Count: Hexes, Counters and Jinxes for the Professional Auror, by Haisley. Both have extensive lists of pretty obscure spells in the glossaries. Maybe you'll find something there.
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Date: 2010-02-12 03:30 am (UTC)Dorcas remembered that the Hogwarts library has some books in the Restricted section which you might try: take a look at Speed and Silence: Effective Defensive Spells for Combat Situations by Featherstone and When Seconds Count: Hexes, Counters and Jinxes for the Professional Auror, by Haisley. Both have extensive lists of pretty obscure spells in the glossaries. Maybe you'll find something there.