Character Analysis
Kendra and Seth don't meet Warren in the book, so we don't either, but when Grandma is asking whether they've seen him, she describes him like this: "'Handsome and quiet? White hair and skin? Dale's brother'" (15.8). Nope, doesn't ring a bell—but we're all for handsome and quiet, so we hope he makes an appearance in one of the later books in this series.
According to Grandma, "his mind has been ruined […] His is another tragic tale of a mortal venturing where he did not belong" (15.39). We don't get much more detail than this, but it's a sobering reminder that Fablehaven isn't all happy fun magic times.