As I have a dragon PC in my player group with a very nice background story involving a dragon as an antagonist, I've been looking around to find adventures or campaigns featuring dragons as antagonists, that I could use in or borrow from for my campaign. I'm not looking for the "dragon who just roasts a few villagers because he can" type of antagonist, but one of the more intelligent types like, "he roasts them because he needs their life essence to enhance his life span as he is a lich" — dragons who have character and motives and are the main antagonists, not written as simply powerful beasts or mere riding pets (which is the impression I always got from the old Dragonlance adventures).

Thus my question: are there any adventures or campaigns that feature dragons as intelligent antagonists, which I could use or take elements from? *(Not limited to Pathfinder system, but the story should be somewhat compatible with the Golarion setting of Pathfinder so I can set it there.)*