Leo looked down and realized his own body had turned to mist too. -Mark of Athena, chapter XXII<<this was such an important part and I am annoyed that some people don't give Hazel as much credit as she deserves.
“I opened my notebook and stared at the photo inside - my friend Annabeth on vacation in Washington, DC. She was wearing jeans and a denim jacket over her orange Camp Half-Blood T-shirt. Her blonde hair was pulled back in a bandanna. She was standing.