MG or YA Fantasy about group of young people who learn they are from another world

[David]

Hi so I read this book about 4-6 years ago about a group of kids who don't know each other at first but learn they are all from another world. One of the girl characters had blue skin another girl could walk on air and a guy was really good at archery. I think the bad guy had something to do with spiders but I'm not sure about that.