Li Shenron said:An "Underground menaces" book could cover constructs and oozes at the same time, plus hazards.
A "Wardens of nature" book could do the same with feys and plants.
Ask Crothian.Kurashu said:While Oozes themselves might not warrent an entire book on their own, they could combine it with another type. What that type would be, I don't know. But I'd be interested in learning of the softer side of oozes. You know the side of them that calls their friends to go out for lunch ("I hear there's a party of adventures coming through later today.") or just wants to spend time with their spouse on a romantic everning ("Honey, that halfling was delicious.").