Pants said:OR you could've advanced them yourself.
Sure you can upgrade SR, HD, skills, feats and all that. Anyone can do that.
What no one can really do is grant them new special attacks and special qualities properly. Take note of the SA and SQ differences between the Demon Lords in FCI and the Demon Lords in Demonomicon. You'll note the lower CR ones have SA and SQ missing. Good example would be Graz'zt, who's missing his ability to use any magic device at will and Pazuzu's abilities are missing too in the lower CR one.
The biggest factor in making a creature unique are it's SA and SQ. Those are the driving points of a creature in battle, something that makes players go "Oooh..." Heck, prime example would be on the D&D Website when they were doing that Make-A-Monster article and it ended up being an aberration with ties to fey creatures with whacky abilities.
Case in point, we can turn the tables around: People can decrease a creature's power as easily as they say we can upgrade it's power. Lower HD, lower SR, patch up the skills, take out some feats...at least you won't lose the SA and SQ, and if you want them out just omit them with a thought.
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