15 Books Found

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"ok so the book i remember was a fantasy book i thin. I read it in elementary/middle school, there might have been a tree? i dont know if im getting that part confused tho. there was like another world type situation and a couple of kids/teens whos teacher knew moer about this world than they did and had to help them and stuff and i think he might have been some kind of mystical being maybe? and in this other world there was one point when a person who i think was the teacher was like tortured and hung from a mountain/waterfall maybe? and the kids saw but thats about all i remember"