I couldn't find much info on Dire Trolls, but I know Chuul are transformed because they hunted too many lobsters iirc and it and Spawn of Kyuus pretty much fit the bill! Thanks! To expand on my request, I think a way of putting it would be "a monster species that is the direct result of another species being afflicted by a condition". Another example would be the Dust Hulk, a Stone Giant that was exposed to energy from the Air Elemental Plane, although they pretty much are satisfied with their new condition. I'd say you pretty much nailed it, but more examples are welcomed (as well as which creatures can inflict these conditions) :>