The Athasian trolls were good. If they were like the trolls in other worlds, there wouldn’t be much pathos in cleansing them because it is hard to imagine what possible contribution a standard D&D troll could make to the world beyond death and destruction.
The revised boxed set, Beyond the Prism Pentad, and Defilers and Preservers: The Wizards of Athas that changed so much canon. As for the revised boxed set, I think it is clear that Bill Slavicsek read the Prism Pentad books, and misinterpreted them, and this is how we ended up with the separation between Champion and advanced being metamorphosis (which I believe are one and the same - Champion being a title, and all of the Champions being advanced beings). Defilers and Preserves basically abrogated the whole concept of defiling by introducing necromancers and cerulean wizards that can draw upon unlimited amounts of renewable energy to the extent that preservers can be considered just as bad as defilers when compared to these magic users.
The Dragon Kings supplement says that it was accidental, and also that the vortices are current extinct.I nonetheless included a method to fashion a vortice in update for the metamorphosis epic spell seed - it isn’t easy though.
Totally agree. Lynn Abbey was doing her best to clear up the confusion caused by the revised boxed set and she wasn’t permitted to contact Troy Denning for advice either.