"Never ever use Euros for protection," Neville declares. "He's great for Divination - you should tell Ginny that, by the way - and decent for offensive magic but he doesn't know what he's talking about with protection. Or maybe the Ancient Greeks were just really badly protected all the time? Anyway..." He pulls one of the books he'd been trying to hide earlier out. "You really want Dryn. And if you're looking at possession, you definitely want rosemary and maybe some fennel?"

He trails off while paging through the book, finally stopping at a long list of herbs, each with a description of its properties, under the heading Protective Herbs.