To that, Hermione sat uncomfortable, looking away. Hogwarts: A History had not mentioned the thestrals, so when Harry had brought it up last year, Hermione had no idea what he was speaking of last year. She still couldn't see them, and there was something strange about not knowing what they looked like. Not entirely. She'd seen drawings of them, and something was horrifying about them...like they belonged to the Four Horseman.