I’m dying to find this one book I read in like 2011 or something. I barely remember much but I think it was a guy who went through a mirror in an abandoned house or something? And he enters a different world. I think he gets sick or something or isn’t accustomed to the world and he’s slowly turning into stone? Onyx or something. And there’s a girl too I think who helps him find someone to cure him so he doesn’t turn into one of the people from that world. There’s also Smaragd people or something.
Thank you in advance. 🥺