"I'm not-" She grits her teeth against- she's not sure what. She feels a kind of disgust at the very idea of creating a Dark Mark, and it's battling against the contradictory horror of allowing Bellatrix to have her fun with anyone, much less someone Hermione likes and respects. "I don't imagine you'd suggest this if it weren't a last resort," she finishes. "Which isn't to say I'll do it. Or that I can do it."

She pauses, trying to work out if she's exaggerating the difficulty in order to have an excuse not to be involved. "I don't know how Voldemort did it, only that it was probably related to the Protean Charm and that it's extremely Dark magic. I have no idea whether it would be safe, what side-effects it might have, how it might go wrong. And it's not exactly something one can practice."