Crothian said:We need a book of oozes
Andrew D. Gable said:We could really use a big old nifty looking purtty hardcover all about the tojanida. We could even title it the Uselessmonsternomicon
nikolai said:I think, as someone else has mentioned, the most original and useful choice would be fey. I don't think this will happen though, given the demand for such a book. My bet would be: Giants, Elemental Creatures (elementals, genies, other inner-plane stuff), maybe even Goblinoids. Maybe there won't be another? With fiends, celestials, dragons and undead already taken care of, a substantial part of the monster corpus has already been used.