Mine are the ahamkara. They're essentially draconic demons, as they make Faustian bargains with you.
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From an aesthetics perspective I've always preferred wyverns. The best example of a wyvern I can give is Smaug in the Hobbit movies. [spoiler]Smaug should be a true dragon, but because he lacks forelegs in the movies he is, in fact, a wyvern.[/spoiler]